There are 3 owner-reported engine complaints for the 2012 GMC Yukonin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2012 GMC Yukon. The contact stated that years ago, the engine was replaced with a rebuilt engine. Recently, after starting the vehicle, there was an abnormal banging sound coming from the engine. The banging sound continued, and the vehicle shut off without warning. Due to the failure, the vehicle was towed to an independent mechanic, and it was discovered that an engine bearing had failed, and the vehicle was diagnosed with engine failure. Neither the dealer nor the manufacturer was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 47,000.
LIFTER FAILURE. HOPING NO CAMSHAFT DAMAGE. 3 WEEKS WAITING ON PARTS THAT APPARENTLY CAN'T BE FOUND. WAS DRIVING APPROX 35 MPH WHEN HORRIBLE TICKING NOISE OCCURRED. QUICKLY ASSESSED NOTHING IN WHEEL WELL. NOISE COMING FROM ENGINE. LIMPED CAR DIRECTLY TO MECHANIC AS FEARED MORE DAMAGE OR COMPLETE ENGINE FAILURE IF DRIVEN MORE MILES. SINCE BECOME AWARE OF ISSUES WITH THIS ENGINE AND THAT CHANGES WERE MADE IN 2014. LESS THAN 90K MILES ON THE CAR.
@ 97,000 MILES, GETTING CYLINDER #4 MISS FIRE CODES, REPLACED ALL PLUGS AND AFFECTED COILS PACKS. NOW MOTOR IS MAKING A TICKING SOUND FORM LIFTERS. DEALER SAID IT NEEDS NEW ENGINE DUE TO THE AFM SYSTEM PROBLEMS.
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