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Kia · Known Issues

2020 Kia Cadenza Problems: 3 Known Issues

2020 model year · 240+ owner reports · Updated September 2026

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According to Au7o's analysis of 240+ owner reports, the 2020 Kia Cadenza has 3 documented known issues, with 2 rated critical. The most serious are 3.3L Lambda II GDI V6 Connecting Rod Bearing Failure ($0-$6,000 repair) and Panoramic Sunroof Glass Spontaneous Shattering ($800-$1,500 repair). The most commonly reported issue is 6-Speed Automatic Transmission Hesitation and Hard Downshift with 110 owner reports. Across all issues with published estimates, repair costs range from $800 to $6,000. DIY maintenance guides at au7o.io.

In This Article

  • Cadenza Engine1
  • Cadenza Body/Panels1
  • Cadenza Transmission1
  • Recalls5
  • FAQ
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In This Article

  • Engine1
  • Body/Panels1
  • Transmission1
  • Recalls5
  • FAQ

All 3 Known Issues

Filter:
ALL YEARS2020201920182017201620152014
Community reported
75 owners

On the 2014-2020 Kia Cadenza 3.3L Lambda II GDI V6, the Cadenza's 3.3L Lambda II GDI V6 is covered under the Hyundai/Kia engine settlement for connecting rod bearing failure. Manufacturing debris in the crankshaft oil passages can restrict oil flow to the connecting rod bearings, causing premature wear and eventual engine seizure. Kia extended the engine warranty to 15 years/150,000 miles. The issue typically manifests as a knocking noise from the bottom end of the engine, often preceded by an illuminated oil pressure warning light.

Common Symptoms

  • Knocking noise from lower engine that increases with RPM
  • Low oil pressure warning light
  • Check engine light illuminated
  • Metal particles visible in oil during oil change
  • Engine stalling or seizing

How to Fix

Contact a Kia dealer immediately for inspection under the extended warranty (15 years/150,000 miles). Kia performs a rod bearing clearance test and inspection. If the bearings are worn, Kia replaces the engine at no cost with a remanufactured unit. Keep all oil change records as proof of maintenance — they are required for warranty claims.

Owner tips & cautions

  • TipCheck with Kia dealer about the 15 year/150,000 mile extended engine warranty — engine replacement is free for covered vehicles
  • TipKeep ALL oil change receipts in the glove box — Kia requires proof of regular oil changes for warranty engine replacement
  • WarningStop driving immediately if you hear knocking — continued driving can cause the rod to punch through the engine block, voiding warranty coverage
Typical repair cost:$0 - $6,000

Research This Issue

Based on 75 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Low Confidence75 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
Community reported
55 owners

On the 2014-2020 Kia Cadenza, the Cadenza equipped with the panoramic sunroof has experienced instances of the tempered glass panel spontaneously shattering without external impact. The glass explodes with a loud pop, showering the interior with small tempered glass fragments. This appears to be caused by stress fractures in the tempered glass from manufacturing defects or frame flex. While tempered glass shatters into small pebble-like pieces rather than sharp shards, the event is extremely startling and leaves the vehicle open to weather.

Common Symptoms

  • Loud pop or explosion sound from roof
  • Sunroof glass shattered with no external impact
  • Small glass fragments throughout interior
  • Wind noise and water intrusion through broken glass
  • Glass shattering while parked (thermal stress)

How to Fix

Cover the opening immediately with plastic sheeting and tape if the glass shatters. File a claim with Kia — some owners have received goodwill coverage for replacement even outside warranty due to the spontaneous nature of the failure. The replacement glass panel from Kia dealer is $800-1,200 installed. Aftermarket sunroof glass is not available for the Cadenza. File a complaint with NHTSA to support potential recall investigation.

Owner tips & cautions

  • TipContact Kia corporate (1-800-333-4542) for goodwill coverage — many owners have received free or reduced-cost replacement due to the spontaneous nature
  • TipFile a complaint with NHTSA at safercar.gov — documented complaints increase the likelihood of a recall investigation
  • WarningKeep a roll of plastic sheeting and duct tape in the trunk — if the glass shatters, you need to weather-proof the opening immediately to prevent interior water damage
Typical repair cost:$800 - $1,500

Research This Issue

Based on 55 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Low Confidence55 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
Community reported
110 owners

On the 2014-2020 Kia Cadenza, the Cadenza's 6-speed automatic transmission (A6LF2) exhibits a hesitation or delayed response when accelerating from low speeds, particularly after coasting to a stop. The transmission seems to "hunt" for the right gear, causing a 1-2 second delay before power delivery. Hard downshifts also occur during passing maneuvers. Kia released multiple TCM software updates to address the shift calibration but many owners report the issue persists.

Common Symptoms

  • Hesitation or delay when accelerating from a stop
  • Hard downshift when passing on the highway
  • Transmission "hunting" between 2nd and 3rd gear at low speed
  • Jolt or jerk during 1-2 upshift
  • Delayed throttle response when merging

How to Fix

Visit a Kia dealer for the latest TCM software update — multiple updates have been released through 2020. A complete transmission fluid drain and fill with Kia SP-IV ATF can improve shift quality. If the problem persists after the software update, the valve body may need replacement. Some owners report improved behavior after an "adaptive learn" reset performed with the KDS scan tool.

Owner tips & cautions

  • TipAsk the dealer to check for the latest TCM software update — Kia has released several recalibrations that specifically address the hesitation issue
  • TipA complete ATF drain and fill with genuine Kia SP-IV fluid often improves shift quality — change every 30,000 miles
  • WarningDo not use aftermarket ATF — the A6LF2 is calibrated specifically for SP-IV viscosity and friction characteristics
Typical repair cost:$0 - $2,000

Research This Issue

Based on 110 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Low Confidence110 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
NHTSA Recalls5 recalls

VISIBILITY:WINDSHIELD

Kia Motors America (Kia) is recalling all 2014-2016 Cadenza vehicles. During manufacturing, the front windshield may not have been properly bonded to the vehicle, allowing it to detach.

Campaign #22V15800015/03/2022

SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

Kia America, Inc. (Kia) is recalling certain 2010-2019 Borrego, 2014-2016 Cadenza, 2010-2013 Forte, Forte Koup, Sportage, 2015-2018 K900, 2011-2015 Optima, 2011-2013 Optima Hybrid, Soul, 2012-2017 Rio, 2011-2014 Sorento, and 2010-2011 Rondo vehicles. The Hydraulic Electronic Control Unit (HECU) may experience an electrical short, which can result in an engine compartment fire while parked or driving.

Campaign #23V65200025/09/2023

VISIBILITY:POWER WINDOW DEVICES AND CONTROLS

Kia Motors America (Kia) is recalling certain 2020 Cadenza vehicles. The rear power windows can be operated by the driver's power window main switch after the ignition has been turned off and a front door is opened. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 118, "Power-Operated Window Systems."

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Frequently Asked Questions

What are the most common Kia Cadenza problems?

According to Au7o's analysis of 240+ owner reports, the 2020 Kia Cadenza has 3 documented issues. The most frequently reported are: 3.3L Lambda II GDI V6 Connecting Rod Bearing Failure, Panoramic Sunroof Glass Spontaneous Shattering, 6-Speed Automatic Transmission Hesitation and Hard Downshift. Of these, 2 are rated critical and should be addressed promptly.

Is the Kia Cadenza reliable?

The 2020 Kia Cadenza has 3 known issues documented across 240+ owner reports. 2 issues are rated critical: 3.3L Lambda II GDI V6 Connecting Rod Bearing Failure and Panoramic Sunroof Glass Spontaneous Shattering. 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 Cadenza problems?

Repair costs for known Kia Cadenza issues range from $0 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 3.3L Lambda II GDI V6 Connecting Rod Bearing Failure, typically costs $0-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2014-2020 Kia Cadenza 3.3L Lambda II GDI V6 Connecting Rod Bearing Failure?

The Cadenza's 3.3L Lambda II GDI V6 is covered under the Hyundai/Kia engine settlement for connecting rod bearing failure. Manufacturing debris in the crankshaft oil passages can restrict oil flow to the connecting rod bearings, causing premature wear and eventual engine seizure. Repairs typically run $0-$6,000. Severity: high.

What is the 2014-2020 Kia Cadenza Panoramic Sunroof Glass Spontaneous Shattering?

The Cadenza equipped with the panoramic sunroof has experienced instances of the tempered glass panel spontaneously shattering without external impact. The glass explodes with a loud pop, showering the interior with small tempered glass fragments. This appears to be caused by str… Repairs typically run $800-$1,500. Severity: high.

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 sourced from 240+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #22V02200021/01/2022

SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

Kia Motors America (Kia) is recalling certain 2017-2021 Sportage and Cadenza vehicles. The electrical circuit in the Hydraulic Electronic Control Unit (HECU) may short-circuit, which can cause a fire in the engine compartment.

Campaign #21V13700004/03/2021

SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM:HOSES, LINES/PIPING, AND FITTINGS

Kia Motors America (Kia) is recalling certain 2017 Cadenza vehicles. The brake vacuum hose on the affected vehicles may kink, reducing braking performance.

Campaign #17V19000016/03/2017

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

What is the 2014-2020 Kia Cadenza 6-Speed Automatic Transmission Hesitation and Hard Downshift?

The Cadenza's 6-speed automatic transmission (A6LF2) exhibits a hesitation or delayed response when accelerating from low speeds, particularly after coasting to a stop. The transmission seems to "hunt" for the right gear, causing a 1-2 second delay before power delivery. Hard dow… Repairs typically run $0-$2,000. Severity: medium.