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Kia · Known Issues

2025 Kia K5 Problems: 4 Known Issues

2025 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2025 Kia K5 has 4 documented known issues. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $10 to $2,000. DIY maintenance guides at au7o.io.

In This Article

  • K5 Electrical2
  • K5 Engine1
  • K5 Body/Panels1
  • Recalls8
  • FAQ
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In This Article

  • Electrical2
  • Engine1
  • Body/Panels1
  • Recalls8
  • FAQ

All 4 Known Issues

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ALL YEARS20252024202320222021

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: Genesis G70, Hyundai Equus, Kia K900

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).

Owner tips & cautions

  • WarningIf 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.
Typical repair cost:$0 - $1,500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence

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: Hyundai Ioniq 5, Hyundai Santa Cruz, Kia Sportage

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.

Owner tips & cautions

  • 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.
Typical repair cost:$0 - $2,000

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence

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.

Owner tips & cautions

  • 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.
Typical repair cost:$0 - $400

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence

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.

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 you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine Kia 81230-L0000 trunk-lid latch assembly
    OEMKia 81230-L0000

    Replace a mechanically or electrically failed trunk latch after command and alignment diagnosis Fitment/availability: 2021-2024 Kia K5 trunk lid; confirm VIN/current EPC before purchase.

    Kia OEM Parts Online
  • Genuine Kia 81230-L8000 trunk-lid latch assembly
    OEMKia 81230-L8000

    Replace a mechanically or electrically failed trunk latch on the facelift branch Fitment/availability: 2025 Kia K5 trunk lid; confirm VIN/current EPC before purchase.

    Kia OEM Parts Online

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • 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.
Typical repair cost:$10 - $400

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
NHTSA Recalls8 recalls

EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE

Kia America, Inc. (Kia) is recalling certain 2025 K5 vehicles. A software error in the Power-net Domain Controller (PDC) may cause the parking lights to flicker. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) 108, "Lamps, Reflective Devices, and Associated Equipment."

Campaign #25V35100027/05/2025

STRUCTURE:BODY:ROOF AND PILLARS

Kia America, Inc. (Kia) is recalling certain 2023-2025 K5 vehicles. The left and right rear window trim pieces may loosen and detach.

Campaign #25V49300028/07/2025

AIR BAGS:SIDE/WINDOW:CURTAIN

Kia America, Inc. (Kia) is recalling certain 2021-2023 K5 vehicles. The side curtain air bags may have been installed incorrectly, causing them not to deploy properly in the event of a crash.

Campaign #23V14900007/03/2023
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Other Kia Models

Kia Forte31Kia Telluride28Kia Carnival26Kia Sportage25Kia EV621Kia Sorento21

Frequently Asked Questions

What are the most common Kia K5 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2025 Kia K5 has 4 documented issues. The most frequently reported are: ADAS Sensor Calibration Faults (Lane Keep, Forward Collision), Infotainment Screen Blackout and Random Reboots, Theta II Engine Knock Sensor Issues and Knock-Related Concerns. None are rated critical, but regular maintenance is recommended.

Is the Kia K5 reliable?

The 2025 Kia K5 has 4 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. 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. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2021-2025 Kia K5 ADAS Sensor Calibration Faults (Lane Keep, Forward Collision)?

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 bu… Repairs typically run $0-$1,500. Severity: medium.

What is the 2021-2025 Kia K5 Infotainment Screen Blackout and Random Reboots?

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… Repairs typically run $0-$2,000. Severity: medium.

What is the 2021-2025 Kia K5 Theta II Engine Knock Sensor Issues and Knock-Related Concerns?

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

AIR BAGS: AIR BAG/RESTRAINT CONTROL MODULE

Kia Motors America (Kia) is recalling certain 2021 Telluride, K5, and Forte vehicles. The Occupant Classification and Detection System (OCS/ODS) unit may not detect the presence of a child restraint system in the front passenger seat. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."

Campaign #21V16400011/03/2021

FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS

Kia Motor America (Kia) is recalling certain 2021 Sorento and 2021-2022 K5 vehicles equipped with 2.5L turbocharged engines. Fuel may leak at the pipe connection between the high-pressure fuel pump and fuel rail.

Campaign #21V51900008/07/2021

+ 3 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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… Repairs typically run $0-$400. Severity: medium.

What is the 2021-2025 Kia K5 Rear Trunk Latch Sticking and Failure to Open?

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 exter… Repairs typically run $10-$400. Severity: low.