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#BS-2021-KIAK5-B5252021 Kia K5Problems, Recalls & Reliability
Based on reports from 265 owners and 6 recalls for this exact model.
Data updated ·NHTSA complaints through October 19, 2026
Preliminary Verdict
Red Flag
Based on 265 complaints, 9 crashes, 3 fires, and 6 recalls. Complaint rate is 5.5x the class average.
Top reported problems
air conditioner stopped working
1 complaints • Severity 10/10
coolant dropping below minimum
1 complaints • Severity 6/10
cruise control and head-on collision gets disabled
1 complaints • Severity 4/10
engine will not turn over
1 complaints • Severity 8/10
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Mechanic Inspection Checklist
56 owners reported fuel system issues — failures commonly reported around 52K miles.
Failure Timeline by Mileage
Peak failure range: 0–30K miles (20 reports) • Median: 52K miles
30,000-Mile Cost Projection
Best Case
Most Likely
Worst Case
Top cost driver: Fuel System (56 reports).
Also in your report
Owner Intelligence
AI-synthesized themes from real complaints
Buyer Lot Checklist
Questions, test drive checks, walk-away triggers
Negotiation Talking Points
Data-backed dollar deductions
Buy / Skip Verdict
Final recommendation with conditions
Where the complaints fall
2021 Kia K5: Known Issues & Problem Areas
Fuel System Issues
Fuel System complaints account for 21% of all reports filed for the 2021 Kia K5, with 56 owners filing complaints with NHTSA. The median mileage at time of complaint is 52,000 miles, suggesting issues tend to surface around the 52K-mile mark.
Electrical Issues
Electrical complaints account for 17% of all reports filed for the 2021 Kia K5, with 45 owners filing complaints with NHTSA. Owners should pay attention to electrical-related symptoms during test drives and pre-purchase inspections.
Engine Issues
Engine complaints account for 12% of all reports filed for the 2021 Kia K5, with 32 owners filing complaints with NHTSA. Owners should pay attention to engine-related symptoms during test drives and pre-purchase inspections.
Drivetrain Issues
Drivetrain complaints account for 7% of all reports filed for the 2021 Kia K5, with 19 owners filing complaints with NHTSA. Owners should pay attention to drivetrain-related symptoms during test drives and pre-purchase inspections.
Data sourced from NHTSA owner complaints and community reports. The full report analyzes severity, repair costs, and failure patterns for each category.
Complaint trend by year
Complaints filed with NHTSA by year for the 2021 Kia K5. Recent trend: stable.
Don't negotiate blind — know what this car costs to own
Repair costs • Negotiation scripts • Mechanic checklist • Buy/skip verdict
Recall History (6 recalls)
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
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."
LANE DEPARTURE: LANE KEEP: STEERING ASSIST
Kia Motors America (Kia) is recalling certain 2021-2022 K5 vehicles equipped with 2.5L T-GDI engines. The Rack-Mounted Motor Driven Power Steering (R-MDPS) system lacks the ability to diagnose communication faults. If a communication fault occurs while driving around a curve with Lane Following Assist (LFA) engaged, the steering assist level may not adjust properly, causing a sudden increase in the steering effort required.
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.
POWER TRAIN:AUTOMATIC TRANSMISSION
Kia Motors, Inc. (Kia) is recalling certain 2021-2022 Sorento and 2021-2023 K5 vehicles. The vehicle's "fail-safe" limited-mobility drive mode may be impaired, when prompted by a transmission oil pump malfunction, which can result in a complete loss of drive power.
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.
+ 1 more recall in the full report
Recall severity analysis & seller scripts
The full report rates each recall's severity and gives you scripts for asking the seller about recall completion.
2021 Kia K5 NHTSA Safety Ratings
Overall
★★★★★5 of 5 stars
Frontal crash
★★★★★4 of 5 stars
Side crash
★★★★★5 of 5 stars
Rollover
★★★★★4 of 5 stars
From NHTSA's New Car Assessment Program (5-Star Safety Ratings). Where NHTSA tested more than one version of this vehicle, the lowest rating is shown.
The worst model year for the Kia K5 is the 2022 — worth knowing if you're cross-shopping years. The biggest problem area is fuel system.
2021 Kia K5 vs. Class Average (Large Cars)
This vehicle
265
Class avg
48
5.5x the class average — significantly more complaints than typical large cars vehicles.
Complaint counts correlate with sales volume — popular vehicles naturally generate more reports. The full report normalizes for this.
About this data
NHTSA Complaints
Federal database of owner-filed safety complaints. 265 records for this vehicle.
NHTSA Recalls
Manufacturer-issued safety recalls. 6 recalls found for this vehicle.
Repair Cost Data
Real-world repair costs from owner reports and independent databases.
Last updated . NHTSA complaints received through October 19, 2026; safety ratings from NHTSA's 5-Star program.
2021 Kia K5: Frequently Asked Questions
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10 sections of AI analysis based on 265 owner reports. Know before you buy.