There are 3 owner-reported engine complaints for the 2016 Kia Cadenzain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
My 2016 Kia Cadenza (VIN [XXX] ) experienced repeated overheating, coolant loss, and eventually white exhaust smoke consistent with internal coolant intrusion. The issue began mid-2025 and worsened over time. Despite reporting overheating and coolant loss to Central Kia of Plano, the dealership failed to diagnose the problem, did not escalate to Techline, and did not check or apply Kia Service Action WTY039, which was active. They returned the vehicle to me still overheating, forcing me into multiple out-of-pocket repairs for coolant, radiator, radiator fan, and water pump replacement. None resolved the issue, and the vehicle became unsafe to drive due to rising temperature and smoke. A second dealer, Mesquite Kia, performed a proper diagnosis. Kia Corporate approved an engine replacement under WTY039 on 11/6/25, and the repair was completed on 11/29/25, confirming the overheating was caused by a covered engine defect. Kia Corporate later denied reimbursement for prior repair attempts by blaming “3rd party repairs,” ignoring that the dealership’s misdiagnosis forced me to seek outside help. This defect created safety hazards including overheating while driving, risk of stalling, coolant intrusion, and visible smoke. I am requesting NHTSA review Kia’s handling of this defect and the failure of Central Kia of Plano to diagnose or escalate a known engine issue, which allowed a safety defect to worsen. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Per the Kia dealer head bolts have loosened up which have resulted in engine failure.
THE CONTACT OWNS A 2016 KIA CADENZA. THE CONTACT STATED UPON STARTING THE VEHICLE, A LOUD RATTLING SOUND WAS COMING FROM THE ENGINE COMPARTMENT. THE CONTACT STATED NO WARNING LIGHT WAS ILLUMINATED. THE VEHICLE WAS TAKEN TO THE LOCAL DEALER AND DIAGNOSED HOWEVER, THE MECHANIC STATED THERE WAS NOTHING TO REPAIR OR REPLACE. THE VEHICLE WAS NOT YET REPAIRED. THE CONTACT RELATED THE FAILURE TO AN UNKNOWN RECALL. THE MANUFACTURER HAD NOT BEEN INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 42,674.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026