2021 Kia K5 Problems: 24 Issues Every Owner Should Know

2021 model year · 1,951+ owner reports · Updated May 2026

According to Au7o's analysis of 1,951+ owner reports, the 2021 Kia K5 has 24 documented known issues, with 9 rated critical. The most serious are 8-Speed DCT Electric Oil Pump Failure ($0-$0 repair), Fuel Tank Expansion and Fire Risk ($0-$0 repair), Battery Drain / No-Start After Sitting (Telematics/Module Sleep Issue) ($180-$1,200 repair), Forward Collision Avoidance Assist (FCA) Phantom Braking Events, SmartStream G2.5 GDI Engine Piston Ring/Oil Consumption Issue, Electronic Parking Brake (EPB) Warning / Auto-Hold Malfunction ($180-$900 repair), Rear Wheel Bearing Premature Failure and Humming Noise ($250-$650 repair), Transmission Control Unit (TCU) Software Fault Causing Harsh Upshifts or Limp Mode (8-Speed AT) and Windshield Optical/Rain Sensor Bracket Detachment (ADAS/Auto Wipers Inoperative) ($250-$1,400 repair). The most commonly reported issue is with 345 owner reports. Across all issues, repair costs range from $10 to $2,000. at .

All 24 Known Issues

When Issues Typically Appear

Windshield Optical/Rain Sensor Bracket Detachment (ADAS/Auto Wipers Inoperative)

1K-30K

Battery Drain / No-Start After Sitting (Telematics/Module Sleep Issue)

1K-40K

Forward Collision Avoidance Assist (FCA) Phantom Braking Events

1K-60K

Wireless Phone Charging Pad Overheating and Device Damage

1K-40K

Electronic Parking Brake (EPB) Warning / Auto-Hold Malfunction

3K-60K

Transmission Control Unit (TCU) Software Fault Causing Harsh Upshifts or Limp Mode (8-Speed AT)

5K-60K

Door Handle/Lock Actuator Failure (Door Won’t Open or Won’t Lock/Unlock)

5K-80K

Steering Column/Intermediate Shaft Clunk or Knock (Low-Speed Turns)

5K-50K

Paint Chipping and Clear Coat Peeling (Hood and Roof Panel)

5K-45K

SmartStream G2.5 GDI Engine Piston Ring/Oil Consumption Issue

8K-50K

Front Suspension Strut Mount/Bearing Noise (Creak/Pop While Turning)

8K-70K

Turbocharger Oil Feed/Return Leak (1.6T) Causing Burning Oil Smell/Smoke

8K-70K

025K50K75K100K mi

Community Reported

345 owners

On the 2021-2023 Kia K5 2.5L Turbocharged, k5 vehicles equipped with the 2.5L turbocharged engine and 8-speed wet dual-clutch transmission may experience electric oil pump failure within the transmission. A manufacturing error can cause the pump to fail, resulting in complete loss of vehicle power while driving. This creates a serious safety hazard, particularly at highway speeds.

This issue also affects: Acura TL, Acura CL, Acura ILX

Common Symptoms

Sudden loss of power while driving
Transmission warning light illumination
Vehicle unable to accelerate
Transmission slipping or failing to engage
Check engine light with transmission codes

How to Fix

Transmission electric oil pump replacement under recall SC250. Complete transmission replacement if internal damage occurred. Software update for transmission control unit.

What Owners Are Using

Parts and tips from 345+ owners who fixed this issue

NoteThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
TipSearch Kia K5 forums and owner groups for real-world experiences and DIY guides
TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
UpgradeComplete clutch replacement kit with disc, pressure plate, and throwout bearing (Exedy OEM Replacement Clutch Kit)
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Typical repair cost:$0 - $0

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High Confidence345 reportsLast reported by owners Feb 2024Reviewed Feb 2026

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58 owners

On the 2021-2024 Kia K5, k5 models equipped with the 8-speed conventional automatic transmission (paired with the 2.5T Turbo engine in higher trims) have generated complaints of harsh, jerky upshifts—particularly the 1-2 and 2-3 shifts—and in some cases the transmission entering limp mode (restricted to lower gears) after a fault is detected. This is distinct from the DCT shudder issue and specifically affects the hydraulic 8AT unit. TSBs from Kia/Hyundai on the shared 8AT platform have addressed TCU software logic for shift pressure and torque converter clutch engagement.

This issue also affects: Acura TL, Acura CL, Acura ILX

Common Symptoms

Hard or jerky upshift felt between 1st-2nd or 2nd-3rd gears
Transmission warning light or check engine light illumination
Vehicle entering limp mode with limited gear availability
Delayed or hunting gear changes during light throttle driving
Transmission slipping sensation before engaging next gear

How to Fix

Kia dealers perform TCU reprogramming via KDS (Kia Diagnostic System) using updated calibration files per TSB TR-004 and related bulletins. In cases of internal valve body damage from repeated harsh shifts, valve body replacement or full transmission replacement may be required. TCU software update is typically covered under powertrain warranty. Valve body replacement parts range from $600–$1,200 plus labor.

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Medium Confidence58 reportsLast reported by owners Invalid DateReviewed May 2026

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180 owners

On the 2021-2024 Kia K5, the K5's 8-speed wet dual-clutch transmission (8DCT) exhibits hesitation during low-speed acceleration and parking lot maneuvers. The clutch engagement logic is programmed too aggressively for smooth daily driving. Kia has released multiple software updates to improve behavior.

Common Symptoms

Hesitation from a dead stop
Shudder at low speed
Jerky parking lot driving
Delayed power delivery
Harsh 1-2 shift
Vibration when creeping in traffic

How to Fix

Visit the dealer for the latest DCT software calibration update. If hesitation persists after the update, the clutch assembly may need replacement under warranty. Avoid riding the brakes on hills, as this overheats the clutch packs.

What Owners Are Using

Parts and tips from 180+ owners who fixed this issue

TipAlways request the latest TCU software update — Kia has revised the K5 DCT calibration multiple times since launch
UpgradeTransmission flush kit for complete fluid exchange to address shudder (Liqui Moly Transmission Flush Kit)
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UpgradeFull synthetic ATF designed to reduce shudder in automatic transmissions (Valvoline MaxLife ATF Full Synthetic)
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Typical repair cost:$0 - $800

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Medium Confidence180 reportsLast reported by owners Mar 2026Reviewed Mar 2026

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134 owners

On the 2021-2024 Kia K5, multiple K5 owners and NHTSA complaints document unexpected, uninitiated hard braking events triggered by the Forward Collision Avoidance Assist system in the absence of any actual obstacle. These phantom braking events occur most commonly on highways, elevated roads, or in areas with overhead signs, bridges, or guardrails that the front radar and camera system misidentifies as collision threats. The issue represents a safety concern as following vehicles may be unable to react in time, increasing rear-end collision risk.

Common Symptoms

Sudden hard braking with no obstacle present
Forward Collision Warning alert with no vehicle or object ahead
FCA system activating on bridges, overpasses, or metal guardrails
Brake lights activating unexpectedly at highway speeds
FCA warning light remaining on after phantom brake event

How to Fix

Kia has released multiple FCA software calibration updates through dealer reprogramming to improve object discrimination and reduce false positives. TSB reference DAS-007 addresses radar and camera fusion logic updates. Owners should have the forward radar sensor (part of the front bumper radar module) and windshield camera inspected for alignment. In persistent cases, FCA can be temporarily disabled via the Driver Assistance menu, though this is not recommended as a permanent fix.

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Medium Confidence134 reportsLast reported by owners Invalid DateReviewed May 2026

On the 2021-2024 Kia K5, owner reports and NHTSA complaints describe the forward-facing camera/rain sensor bracket at the windshield separating or losing adhesion, which can cause the camera module to shift out of position. This can trigger driver-assistance warnings and disable features like Lane Following Assist/Forward Collision-Avoidance Assist and/or cause erratic automatic wiper behavior. The issue is typically tied to windshield bracket bonding/installation and is often noticed after temperature swings or windshield replacement.

Common Symptoms

Lane assist/forward collision warnings and features disabled
Automatic wipers stop working or behave erratically
Camera calibration/aiming DTCs or calibration failure
Rattling/loose module at top center of windshield

How to Fix

Inspect the windshield-mounted bracket and camera/sensor alignment; re-bond/replace the windshield bracket or replace the windshield if the bracket is integral. Reinstall and calibrate the front camera using Kia scan tool procedures; if the windshield was replaced, ensure OEM glass and correct bracket are used. Dealers may reference Kia service guidance/TSB procedures for front camera calibration after windshield/bracket service.

Typical repair cost:$250 - $1,400

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Medium Confidence45 reportsLast reported by owners Invalid DateReviewed Apr 2026

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160 owners

On the 2021-2023 Kia K5, nHTSA complaints and owner reports describe repeated dead 12V batteries and no-start conditions after the vehicle sits for 1–3 days. Reports often point to excessive parasitic draw from modules not entering sleep mode (commonly infotainment/telematics-related) or repeated wake-ups. Owners experience jump-start needs, battery replacements, and intermittent recurrence.

This issue also affects: Jeep Grand Wagoneer, Chrysler 200, Dodge Dart

Common Symptoms

No-crank/no-start after sitting overnight or a few days
Repeated jump-starts required
Battery warning or low-voltage behavior (dim lights, resets)
Intermittent recurrence after battery replacement

How to Fix

Perform parasitic draw testing with an ammeter and isolate the circuit causing draw; check for module wake events and apply Kia software updates where available. Replace the 12V battery if it has been deeply discharged multiple times, and repair/replace the offending module (often telematics/infotainment-related) if it fails to sleep. Verify current draw meets Kia specifications after repairs.

Typical repair cost:$180 - $1,200

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Medium Confidence160 reportsLast reported by owners Invalid DateReviewed Apr 2026

On the 2021-2023 Kia K5, k5 models equipped with the optional wireless charging pad have generated NHTSA complaints and owner forum reports describing the pad running excessively hot during charging cycles, causing smartphones to display thermal warnings and in some cases warping or discoloring the charging pad surface. The issue appears related to inadequate thermal management in the Qi charging module integrated into the center console. Kia issued a software update for the UVO telematics/charging control module on some vehicles to limit charging output and improve thermal cutoff response.

Common Symptoms

Smartphone displays overheating warning while on charging pad
Charging pad surface becomes uncomfortably hot to touch
Discoloration or warping of charging pad surface
Phone charges slowly or intermittently due to thermal throttling
Charging pad ceases functioning after thermal shutdown event

How to Fix

Kia dealers can apply a software update to the wireless charging control module addressing thermal limits per internal service guidance. If the pad surface is physically damaged, the center console wireless charging module assembly requires replacement. Owners experiencing device damage should document and file with Kia Customer Assistance for consideration of device compensation.

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Medium Confidence47 reportsLast reported by owners Invalid DateReviewed May 2026

On the 2021-2025 Kia K5, the K5 infotainment system — both the 8-inch and 10.25-inch displays — experiences random screen blackouts, freezes, and spontaneous reboots. The screen may go completely black while driving, losing access to navigation, backup camera, and climate controls. Some owners report the system rebooting in a loop. The issue is typically software-related but can also be caused by a failing display head unit. Android Auto and Apple CarPlay connections can trigger or worsen the problem.

This issue also affects: Dodge Hornet, Hyundai Ioniq 5, Chevrolet Silverado 1500

Common Symptoms

Infotainment screen goes completely black while driving
System freezes and becomes unresponsive to touch
Screen reboots with Kia logo repeatedly
Backup camera unavailable when in reverse
Bluetooth audio cutting out
Climate controls unresponsive on touchscreen-only models

How to Fix

First try a system reset by holding the power/volume knob for 10+ seconds. Visit a Kia dealer for the latest infotainment software update — Kia has released multiple updates addressing stability issues (check for updates via the Kia Connect app or USB update). If the software update does not resolve the issue, the head unit may need replacement under warranty ($800-$2,000 if out of warranty). Disconnect the phone and disable wireless CarPlay/Android Auto to test if the issue is phone-related. A factory reset of the infotainment (Settings > General > Reset) can also help.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

TipBefore going to the dealer, try a USB software update. Download the latest navigation/infotainment update from the Kia owners portal, put it on a USB drive, and install it. Many blackout issues are fixed by the latest software.
TipIf the screen goes black, hold the power knob for 10 seconds to force a reboot. This is faster than disconnecting the battery and usually restores the system immediately.
UpgradeProfessional OBD-II diagnostic scanner for reading infotainment and body module codes (BlueDriver Bluetooth Pro OBD2 Scan Tool)
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UpgradeOEM-quality replacement sensor for accurate readings and proper system function (Bosch Replacement Sensor)
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Typical repair cost:$0 - $2,000

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High Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

On the 2021-2025 Kia K5, the Advanced Driver Assistance Systems on the K5 — including Lane Keep Assist, Forward Collision Avoidance, and Blind Spot Monitoring — intermittently throw calibration faults and disable themselves. The forward-facing camera behind the windshield and radar sensor in the front bumper are sensitive to windshield contamination, extreme temperatures, and minor front-end impacts. After a windshield replacement, the ADAS sensors require recalibration that many glass shops skip or perform incorrectly.

This issue also affects: Ford Bronco, Ford Mustang, Hyundai Equus

Common Symptoms

Lane Keep Assist warning light and system disabled
Forward Collision warning malfunction message
Blind Spot Monitor not functioning
Multiple ADAS warning lights on dashboard
Systems disabling in rain, fog, or extreme cold
Phantom braking from Forward Collision system

How to Fix

For intermittent faults in normal conditions: clean the windshield interior and exterior thoroughly around the camera area. Ensure the camera lens cover behind the rearview mirror is clean and unobstructed. A dealer scan and ADAS recalibration costs $200-$500. After windshield replacement, ALWAYS have the ADAS camera recalibrated at a Kia dealer — this requires specialized targets and equipment. If faults persist, the camera module or radar sensor may need replacement ($500-$1,500).

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

NoteIf you get your windshield replaced, INSIST on ADAS recalibration. The camera must be recalibrated to the new windshield or your safety systems will not function correctly. Budget $300-$500 for this.
UpgradeAutomotive relay replacement set for common relay failures (Bosch Automotive Relay 5-Pin 12V)
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UpgradeDigital multimeter for diagnosing fuse, relay, and module electrical faults (Innova Digital Multimeter)
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UpgradeOEM-quality replacement sensor for accurate readings and proper system function (Bosch Replacement Sensor)
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Typical repair cost:$0 - $1,500

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Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

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On the 2021-2024 Kia K5, owners of K5 models equipped with the 2.5L naturally aspirated GDI engine (SmartStream G2.5) have reported excessive oil consumption between change intervals, sometimes consuming over a quart per 1,000 miles. The root cause is linked to piston ring sealing tolerances that allow oil to enter the combustion chamber, producing blue smoke from the exhaust on cold starts and acceleration. NHTSA complaint database reflects multiple owners reporting this on 2021-2023 model years, with Kia issuing TSB guidance for inspection and potential short block replacement.

This issue also affects: Buick Lucerne, Acura TL, Audi Q7

Common Symptoms

Blue/white smoke from exhaust on cold start or hard acceleration
Low oil level warning light before scheduled oil change
Fouled spark plugs causing rough idle
Burning oil smell from engine bay
Oil level dropping more than 1 quart per 1,000 miles

How to Fix

Kia dealerships perform an oil consumption test over 3,000-mile intervals per TSB ENG 023. If consumption exceeds specification, piston rings or short block assembly replacement is authorized under warranty. Short block part numbers vary by build date; dealers reference Kia's warranty claim system. Out-of-warranty repair involves short block replacement costing $3,500–$6,000.

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Medium Confidence85 reportsLast reported by owners Invalid DateReviewed May 2026

On the 2021-2024 Kia K5 1.6T, owner reports and NHTSA complaints on 1.6L turbo K5 models describe oil seepage/leaks around the turbocharger oil feed/return lines or related seals, sometimes producing a burning oil smell and light smoke after driving. Heat cycling can harden seals or loosen fittings, allowing oil to drip onto hot exhaust components. Owners typically notice odor in the cabin at stops and oil residue near the turbo area.

This issue also affects: Alfa Romeo Stelvio, Hyundai Kona, Kia Sportage

Common Symptoms

Burning oil smell after driving
Light smoke from engine bay near turbo area
Oil residue around turbocharger lines
Gradual oil level drop between services

How to Fix

Inspect turbo oil feed and return lines, banjo bolts, and sealing washers/gaskets for seepage; clean and recheck after a drive. Replace leaking oil line assemblies and sealing washers/gaskets (commonly crush washers at banjo fittings) and torque to specification; verify no oil contacts the exhaust. After repair, monitor oil level and confirm no further smoke/odor.

Typical repair cost:$220 - $1,200

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Medium Confidence35 reportsLast reported by owners Invalid DateReviewed Apr 2026

On the 2021-2025 Kia K5 2.5L Theta II, the 2.5L Theta II engine in certain K5 models has experienced knock sensor faults and engine knock concerns. The knock sensor may trigger false positives or fail to detect actual detonation, causing the ECU to either retard timing unnecessarily (reducing power) or fail to protect against harmful knock. Kia issued a software update to improve knock detection logic, but some owners report persistent issues after the update.

This issue also affects: Hyundai Sonata, Kia Optima, Kia Sorento

Common Symptoms

Check engine light with knock sensor codes
Reduced engine power or sluggish acceleration
Audible pinging or knocking under load
Poor fuel economy from excessive timing retard
Engine hesitation during acceleration

How to Fix

Visit a Kia dealer for the latest ECU software update (TSB SA508) that improves knock detection calibration — this is typically performed at no cost. If the knock sensor itself has failed, replacement costs $200-$400 including labor. Use only 87+ octane fuel as specified. If actual engine knock is present (metallic pinging under load), have the engine inspected immediately as the Theta II engine family has a known history of connecting rod bearing issues in earlier applications. Kia has extended warranty coverage on some Theta II engines.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

TipCheck if your VIN is covered under the Kia engine warranty extension. Many Theta II engines have extended coverage to 150,000 miles for knock-related failures.
TipRequest the latest ECU calibration update at every service visit. Kia has released multiple updates to improve knock detection and engine protection logic.
UpgradeReplacement knock sensor eliminates false detonation readings (Bosch Knock Sensor)
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Typical repair cost:$0 - $400

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Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

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62 owners

On the 2021-2024 Kia K5, a number of K5 owners have reported premature rear wheel bearing failure, typically presenting as a low-pitched humming or growling noise that changes with vehicle speed and varies when turning left or right. The issue has been observed on both FWD and AWD variants and appears linked to bearing press-fit tolerances in the rear knuckle assembly. NHTSA complaints and owner forums document failures occurring well before expected service life, sometimes as early as 25,000 miles.

This issue also affects: Ford Explorer

Common Symptoms

Humming or growling noise that increases with vehicle speed
Noise changes pitch or volume when turning or changing lanes
Vibration felt through floorboard or seat at highway speeds
ABS or traction control warning light illumination (in advanced cases)
Looseness or play detected at wheel during inspection

How to Fix

Replacement of the rear wheel bearing/hub assembly is required. The rear bearing is an integrated hub unit (Kia part number 52730-L1000 or equivalent by production date). Labor requires knuckle removal; dealership or independent repair is approximately 1.5–2 hours per side. AWD variants may require additional drivetrain disassembly.

Typical repair cost:$250 - $650

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Medium Confidence62 reportsLast reported by owners Invalid DateReviewed May 2026

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110 owners

On the 2021-2024 Kia K5, kia K5 owners report creaking, popping, or groaning noises from the front suspension during steering input, especially at low speeds or when parking. The issue is often tied to strut mount bearings binding or premature wear, sometimes exacerbated by moisture intrusion. The noise can be mistaken for steering rack issues but is frequently localized to the upper strut mounts.

This issue also affects: Fiat 500L, Kia Forte

Common Symptoms

Creaking/groaning when turning steering wheel
Popping noise during parking maneuvers
Noise more noticeable in wet/cold conditions
Front-end noise over low-speed bumps

How to Fix

Confirm noise source with chassis ears and inspect upper strut mounts and bearings for binding or damage. Replace the affected strut mount/bearing assemblies and verify proper spring indexing; perform alignment afterward. If present, address water intrusion and ensure correct torque on top mount hardware.

Typical repair cost:$250 - $900

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Medium Confidence110 reportsLast reported by owners Invalid DateReviewed Apr 2026

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85 owners

On the 2021-2023 Kia K5, owner reports and NHTSA complaints describe a clunk/knock felt through the steering wheel during low-speed turning or over small bumps. The condition is commonly associated with play in the intermediate steering shaft, column coupling, or related fasteners/bushings. Drivers report a noticeable tactile knock and noise that can worsen over time.

This issue also affects: GMC Sierra 1500, Chevrolet Colorado, Dodge Avenger

Common Symptoms

Clunk/knock in steering wheel at low speed
Noise when turning into driveways/parking maneuvers
Vibration or looseness felt through steering
Intermittent clicking over small bumps

How to Fix

Inspect the intermediate shaft and steering column coupling for play and verify torque on related fasteners. Replace the intermediate steering shaft/coupler if excessive looseness is found; some repairs involve updated parts and re-torque procedures per Kia service guidance. Perform an alignment check after steering component replacement.

Typical repair cost:$120 - $650

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Medium Confidence85 reportsLast reported by owners Invalid DateReviewed Apr 2026

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234 owners

On the 2021-2023 Kia K5, a damaged check valve in the fuel system can allow air to enter the fuel tank, causing it to expand. The expanded tank may contact hot exhaust components, potentially melting the tank and creating a fire hazard.

Common Symptoms

Fuel odor inside or around vehicle
Visible swelling or deformation of fuel tank
Difficulty refueling
Fuel gauge reading inaccurately
Hissing sound from fuel system

How to Fix

Fuel system check valve inspection and replacement under recall. Fuel tank replacement if expansion damage has occurred. Complete fuel system inspection for heat damage.

What Owners Are Using

Parts and tips from 234+ owners who fixed this issue

NoteThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
TipSearch Kia K5 forums and owner groups for real-world experiences and DIY guides
TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
UpgradeSpectra Premium fuel tank — direct OE replacement (Spectra Premium Fuel Tank)
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Typical repair cost:$0 - $0

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High Confidence234 reportsLast reported by owners Feb 2024Reviewed Feb 2026

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70 owners

On the 2021-2024 Kia K5, nHTSA complaints and owner reports note intermittent EPB warnings and Auto-Hold faults on Kia K5, sometimes accompanied by the parking brake not applying/releasing as expected. The issue is commonly linked to EPB actuator/motor faults, wiring/connector issues at the rear calipers, or control module logic faults. Owners typically experience warning messages, chimes, and loss of Auto-Hold functionality.

Common Symptoms

EPB warning light/message on cluster
Auto-Hold unavailable or turns off unexpectedly
Parking brake fails to apply or release
Chime and multiple brake/ESC warnings

How to Fix

Scan for EPB/ESC fault history and inspect rear caliper EPB actuators, connectors, and harness routing for corrosion or damage. Replace the affected EPB actuator/caliper assembly if the motor is failing; perform EPB service mode initialization and verify Auto-Hold operation. If applicable, apply Kia software updates per dealer service bulletins addressing EPB/Auto-Hold warnings.

Typical repair cost:$180 - $900

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Medium Confidence70 reportsLast reported by owners Invalid DateReviewed Apr 2026

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95 owners

On the 2021-2024 Kia K5, owner reports and NHTSA complaints note exterior door handles and/or door lock actuators failing, leading to doors that won’t open from outside (and sometimes inside) or won’t lock/unlock reliably. Failures are commonly tied to actuator motor wear, latch mechanism binding, or linkage issues inside the door. Owners often report intermittent operation that progresses to complete failure.

This issue also affects: Land Rover Range Rover Velar, GMC Yukon XL

Common Symptoms

Door won’t open from outside
Intermittent lock/unlock operation
Key fob works but door remains locked
Grinding/clicking noise inside door when locking

How to Fix

Remove door trim panel and inspect latch/handle linkage and actuator operation. Replace the failed door lock actuator and/or latch assembly and verify proper cable/rod adjustment; lubricate latch mechanisms. If the exterior handle mechanism is damaged, replace the handle assembly and confirm keyless entry operation.

Typical repair cost:$180 - $650

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Medium Confidence95 reportsLast reported by owners Invalid DateReviewed Apr 2026

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76 owners

On the 2021-2024 Kia K5, k5 owners across multiple model years have reported premature paint chipping on the hood and roof panels, with the clear coat peeling in flakes or bubbling in affected areas. This is documented in Kia owner forums and in some NHTSA complaints, particularly in darker colors such as Gravity Gray and Aurora Black Pearl. The issue is attributed to insufficient paint film thickness or adhesion on horizontal panels most exposed to UV radiation and road debris impact, and is a known issue on the shared Sonata/K5 platform. Some owners have had repaints or touch-up coverage denied under warranty as cosmetic exclusions.

Common Symptoms

Small paint chips on hood leading edge without identifiable rock impact
Clear coat peeling or flaking from roof or hood in irregular patches
Bubbling or lifting of clear coat under sunlight
Color fading or hazing on horizontal panels disproportionate to age
Rust spotting developing at paint chip locations in humid climates

How to Fix

Kia's new vehicle limited warranty covers paint defects for 3 years or 36,000 miles; owners experiencing premature peeling within this window should request a paint warranty claim at the dealership with documentation. Out-of-warranty repairs require professional repaint of affected panels; hood repaint costs $400–$900 and full roof repaint $500–$1,200 at a body shop. Paint protection film (PPF) application proactively prevents recurrence.

Typical repair cost:$200 - $1,800

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Medium Confidence76 reportsLast reported by owners Invalid DateReviewed May 2026

On the 2021-2025 Kia K5, the electric trunk latch mechanism on the K5 is prone to sticking or failing to release, leaving the trunk locked. The issue is more common in cold weather when moisture gets into the latch mechanism and freezes. The trunk release button on the key fob, interior button, and exterior trunk handle may all fail to open the trunk when the latch is stuck. Some owners report the latch actuator motor failing entirely, requiring manual release from inside the trunk via the emergency release handle.

This issue also affects: Chevrolet Malibu

Common Symptoms

Trunk will not open from key fob button
Interior trunk release button unresponsive
Trunk latch clicks but does not release
Trunk opens intermittently or requires multiple presses
Trunk stuck closed in cold weather

How to Fix

Lubricate the trunk latch mechanism with white lithium grease or silicone spray every 6 months to prevent sticking ($5-$10). If the latch actuator motor has failed, replace the entire trunk latch assembly ($100-$200 for parts, $100-$200 labor). In an emergency, access the trunk from the rear seat pass-through or use the emergency release handle inside the trunk. The dealer can reprogram the trunk open/close module if the issue is software-related. Apply dielectric grease to the latch electrical connector to prevent corrosion.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

TipSpray the trunk latch with silicone lubricant before winter. This prevents moisture from freezing the mechanism shut in cold weather. Takes 30 seconds and saves a lot of frustration.
UpgradeDorman OE-replacement door latch assembly — direct fit (Dorman Door Latch Assembly)
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UpgradeDorman replacement door handle — matches OEM spec (Dorman Door Handle)
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Typical repair cost:$10 - $400

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On the 2021-2025 Kia K5, k5 models equipped with the panoramic sunroof experience rattling noises from the sunroof area at highway speeds and over rough roads. The sunroof glass and frame develop play over time, creating an annoying rattling or buzzing sound. Some owners also report water leaks at the front corners of the sunroof, with water dripping onto the headliner or A-pillar trim. Clogged sunroof drain tubes exacerbate the leak issue.

This issue also affects: Hyundai Kona, Alfa Romeo Stelvio, Kia Sorento

Common Symptoms

Rattling or buzzing noise from roof area at speed
Water dripping from headliner near sunroof edges
Water stains on A-pillar or headliner fabric
Wind noise increase over time
Musty smell from wet headliner

How to Fix

For rattling: the dealer can apply felt tape or foam padding to the sunroof frame contact points under warranty (TSB available). Adjusting the sunroof glass alignment can also eliminate rattles. For water leaks: clean the sunroof drain tubes by carefully feeding a flexible wire or compressed air through each corner drain. The tubes run down the A-pillars and C-pillars to exit near the wheel wells. If the headliner is water-stained, it may need replacement ($500-$1,000). Apply sunroof sealant to the front weatherstrip if dealer adjustment does not stop the leak.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

TipClean sunroof drains every spring. Pour a small amount of water around the sunroof seal and watch for it to exit under the car near the front and rear wheel wells. If it does not drain, the tubes are clogged.
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Typical repair cost:$0 - $1,000

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Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

Community Reported

60 owners

On the 2021-2024 Kia K5, k5 owners report blower motors that begin squealing, chirping, or rattling and may intermittently stop, reducing cabin airflow. The condition is typically caused by blower motor bearing wear, debris intrusion, or resistor/control issues depending on trim. Symptoms often start as noise at certain fan speeds and progress to reduced or no airflow.

Common Symptoms

Squealing/chirping from passenger-side dash
Rattling noise that changes with fan speed
Intermittent or no airflow from vents
Burning smell or hot resistor symptoms (in some cases)

How to Fix

Inspect cabin air filter housing and blower for debris; replace the cabin filter if restricted. Replace the blower motor assembly if bearings are noisy or the motor is intermittent; if speed control is erratic, test/replace the blower resistor or blower control module as applicable. Verify HVAC operation across all speeds after repair.

Typical repair cost:$120 - $550

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Medium Confidence60 reportsLast reported by owners Invalid DateReviewed Apr 2026

On the 2021-2024 Kia K5, k5 owners with heated and ventilated seat packages have reported failures of the seat heating elements—particularly in the rear seat areas—as well as ventilation fan noise or complete fan failure in the front seats. Seat heating elements can develop open circuits causing partial or complete loss of heat, often on one side of the seat. Ventilated seat blower motors have been reported to produce rattling or grinding noises, sometimes from debris infiltration or motor bearing wear, a known issue documented on multiple Kia and Hyundai shared platforms.

Common Symptoms

Seat heat indicator lit but seat not warming, or only partial warming
Grinding or rattling noise from seat base during ventilation use
Ventilated seat providing no airflow despite being activated
Seat heat or ventilation function cutting off intermittently
One zone of heated seat (cushion or back) working while other does not

How to Fix

For failed heating elements, the seat cushion or seatback heater mat assembly must be replaced; front seat heater mats are accessed by removing seat upholstery (Kia part numbers 88350-L3010 / 88360-L3010 for cushion/back heater pads, vary by trim). For ventilation fan noise, the blower motor within the seat frame is replaced; dealers reference seat disassembly procedures in KDS. Labor is significant due to seat upholstery removal.

Typical repair cost:$150 - $850

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Medium Confidence39 reportsLast reported by owners Invalid DateReviewed May 2026

Frequently Asked Questions

What are the most common Kia K5 problems?

According to Au7o's analysis of 1,951+ owner reports, the 2021-2021 Kia K5 has 24 documented issues. The most frequently reported are: 8-Speed DCT Electric Oil Pump Failure, Fuel Tank Expansion and Fire Risk, Battery Drain / No-Start After Sitting (Telematics/Module Sleep Issue). Of these, 9 are rated critical and should be addressed promptly.

Is the Kia K5 reliable?

The 2021-2021 Kia K5 has 24 known issues documented across 1,951+ owner reports. 9 issues are rated critical: 8-Speed DCT Electric Oil Pump Failure and Fuel Tank Expansion and Fire Risk and Battery Drain / No-Start After Sitting (Telematics/Module Sleep Issue) and Forward Collision Avoidance Assist (FCA) Phantom Braking Events and SmartStream G2.5 GDI Engine Piston Ring/Oil Consumption Issue and Electronic Parking Brake (EPB) Warning / Auto-Hold Malfunction and Rear Wheel Bearing Premature Failure and Humming Noise and Transmission Control Unit (TCU) Software Fault Causing Harsh Upshifts or Limp Mode (8-Speed AT) and Windshield Optical/Rain Sensor Bracket Detachment (ADAS/Auto Wipers Inoperative). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Kia K5 problems?

Repair costs for known Kia K5 issues range from $0 to $2,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 8-Speed DCT Electric Oil Pump Failure, typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2021-2024 Kia K5 Brake Booster / Vacuum Pump Noise and Reduced Brake Assist (1.6T)?

On 1.6T turbocharged K5 variants, some owners and NHTSA complainants have reported a hissing sound from the brake booster area upon brake pedal application, accompanied by a noticeably harder brake pedal and reduced power assistance. The GDi turbocharged engine uses an electric v… Repairs typically run $50-$900. Severity: critical.

All 24 Known Issues

When Issues Typically Appear

2021-2023 Kia K5: 8-Speed DCT Electric Oil Pump Failure#

Common Symptoms

How to Fix

What Owners Are Using

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2021-2024 Kia K5: Transmission Control Unit (TCU) Software Fault Causing Harsh Upshifts or Limp Mode (8-Speed AT)#

Common Symptoms

How to Fix

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2021-2024 Kia K5: 8-Speed DCT Low-Speed Hesitation and Shudder#

Common Symptoms

How to Fix

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2021-2024 Kia K5: Forward Collision Avoidance Assist (FCA) Phantom Braking Events#

Common Symptoms

How to Fix

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2021-2024 Kia K5: Windshield Optical/Rain Sensor Bracket Detachment (ADAS/Auto Wipers Inoperative)#

Common Symptoms

How to Fix

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2021-2023 Kia K5: Battery Drain / No-Start After Sitting (Telematics/Module Sleep Issue)#

Common Symptoms

How to Fix

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2021-2023 Kia K5: Wireless Phone Charging Pad Overheating and Device Damage#

Common Symptoms

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2021-2025 Kia K5: Infotainment Screen Blackout and Random Reboots#

Common Symptoms

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2021-2025 Kia K5: ADAS Sensor Calibration Faults (Lane Keep, Forward Collision)#

Common Symptoms

How to Fix

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2021-2024 Kia K5: SmartStream G2.5 GDI Engine Piston Ring/Oil Consumption Issue#

Common Symptoms

How to Fix

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2021-2024 Kia K5: Turbocharger Oil Feed/Return Leak (1.6T) Causing Burning Oil Smell/Smoke#

Common Symptoms

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2021-2025 Kia K5: Theta II Engine Knock Sensor Issues and Knock-Related Concerns#

Common Symptoms

How to Fix

What Owners Are Using

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2021-2024 Kia K5: Rear Wheel Bearing Premature Failure and Humming Noise#

Common Symptoms

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2021-2024 Kia K5: Front Suspension Strut Mount/Bearing Noise (Creak/Pop While Turning)#

Common Symptoms

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2021-2023 Kia K5: Steering Column/Intermediate Shaft Clunk or Knock (Low-Speed Turns)#

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2021-2023 Kia K5: Fuel Tank Expansion and Fire Risk#

Common Symptoms

How to Fix

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2021-2024 Kia K5: Electronic Parking Brake (EPB) Warning / Auto-Hold Malfunction#

Common Symptoms

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2021-2024 Kia K5: Door Handle/Lock Actuator Failure (Door Won’t Open or Won’t Lock/Unlock)#

Common Symptoms

How to Fix

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