2021 Kia K5 problems & reliability
165 owner complaints filed with NHTSA for the 2021 Kia K5, alongside 6 safety recall campaigns. Last verified Sep 22, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several components.
6 complaints report injuries (7 injured, 1 deaths reported).
Federal crash records (FARS 2020–2023): 2021 Kia K5 vehicles were involved in 58 fatal crashes with 30 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Electrical System → | 45 | 27% |
| Fuel/propulsion System → | 42 | 25% |
| Unknown / Other | 32 | 19% |
| Engine → | 29 | 18% |
| Power Train → | 17 | 10% |
| Fuel System, Gasoline → | 13 | 8% |
| Air Bags → | 10 | 6% |
| Forward Collision Avoidance | 9 | 5% |
| Lane Departure | 9 | 5% |
| Service Brakes | 9 | 5% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 19 reported components →Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Among the 27 complaints that included a usable odometer reading, the median reported incident mileage was 56,000 miles (middle 50% between 13,850 and 104,500 miles).
Complaints by incident year
What owners report
“Vehicle experienced a severe engine misfire (P0302), rough running, and loss of power while driving. Dealership confirmed the Purge Control / PCV valve failed (replaced under Recall SC356 / 25V-794), but charged out-of-pocket for the Cylinder 2 ignition coil that failed as a direct result of the PCV valve failure. The…”
Fuel/propulsion System · filed Sep 16, 2026
“The panoramic glass of the sunroof exploded out while driving on the freeway. A large piece of the glass exploded outwards and could not be retrieved. It was not damaged by external impact as other cars were not close enough to kick back rocks, debris, etc. The sunroof glass had no damage prior to shattering. Hazard…”
Unknown / Other · filed Aug 27, 2026
“The contact owned a 2021 Kia K5. The contact stated that while driving at an undisclosed speed, the vehicle stalled. The failure was a recurring failure. The message "Not Emissions Ready" was displayed. The vehicle was towed. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The…”
Engine and Engine Cooling · filed Aug 24, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
134 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Kia K5. The 10 most recent:
VOLUNTARY SERVICE CAMPAIGN & WARRANTY EXTENSION CAMPAIGN: OWNER RENOTIFICATION (SC307/WTY037) - This document is the owner renotification advising that Kia is conducting a Voluntary Service Campaign to relocate and…
SC307_OWNR_301 · Service Campaign · issued Jun 18, 2026
VOLUNTARY SERVICE CAMPAINGN: REIMBURSEMENT FORM (SC307 Flight#301) - This document is a Reimbursement Request form that was mailed with the customer letter advising them to submit the form if they had paid for repairs…
SC307_REIMB · Service Campaign · issued Jun 17, 2026
TECHNICAL SERVICE BULLETIN: CUSTOMER SATISFACTION: THEFT DETERRENT IGNITION CYLINDER PROTECTOR AND DECAL INSTALLATION (CS2312) - This bulletin has been revised to include additional information. New/revised sections of…
CS2312_TSB_R2 · Service Bulletin/Repair Instructions · issued Jun 8, 2026
TECHNICAL SERVICE BULLETIN: INFOTAINMENT SYSTEM SOFTWARE UPDATE USING UPDATE.KIA.COM - This bulletin provides information and service procedures for updating the infotainment systems on applicable Kia vehicles using the…
TSB_ELE422 · Service Bulletin/Repair Instructions · issued May 28, 2026
TECHNICAL SERVICE BULLETIN: INFOTAINMENT SOFTWARE UPDATE PROCEDURE - This bulletin provides information on the process for downloading infotainment software updates and preparing USB for installation on applicable Kia…
TSB_ELE417 · Service Bulletin/Repair Instructions · issued Apr 14, 2026
TECHNICAL SERVICE BULLETIN: CUSTOMER SATISFACTION: THEFT DETERRENT IGNITION CYLINDER PROTECTOR AND DECAL INSTALLATION (CS2312) - This bulletin has been revised to include additional information. New/revised sections of…
TSB_CS2312_R1 · Service Bulletin/Repair Instructions · issued Feb 19, 2026
TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: FUEL TANK AND/OR PCSV CHECK VALVE INSPECTION/REPLACEMENT + ECU SW UPGRADE (SC288/SC288A) CLOSED & SUPERSEDED - This bulletin is now closed and superseded…
SC288_TSB_R6_CLSD · Emissions · issued Jan 16, 2026
TECHNICAL SERVICE BULLETIN: CUSTOMER SATISFACTION: THEFT DETERRENT IGNITION CYLINDER PROTECTOR AND DECAL INSTALLATION (CS2312) - This bulletin provides information to install a Theft Deterrent Ignition Cylinder…
TSB_CS2312 · Service Bulletin/Repair Instructions · issued Dec 18, 2025
CUSTOMER SATISFACTION CAMPAIGN: OWNER NOTIFICATION (CS2312) - This document is the owner notification advising that Kia is conducting Customer Satisfaction Campaign. A software upgrade that addresses the social media…
CS2312_OWNR · Other · issued Dec 17, 2025
PITSTOP: TECHNICAL OPERATIONS: EXTERNAL DAMAGE TO ULTRASONIC SENSOR: This Pitstop provides information related to Parking Distance Warning (PDW) alerts and repairs involving ultrasonic sensors. The PDW system alerts the…
PS797 · Other · issued Dec 9, 2025
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2021 Kia K5 has 6 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2021 Kia K5?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Among complaints with usable mileage, the median reported incident mileage was 56,000 miles. This does not predict when a particular vehicle will develop a problem.