2015 GMC YUKON DENALI Complaints

The contact owns a 2015 GMC Yukon Denali. The contact stated that while driving 80 MPH, the vehicle hesitated, and failed to accelerate as intended while depressing the accelerator pedal. In addition, there was an abnormal knocking sound coming from underneath the passenger’s side of the vehicle. The check engine warning light was illuminated. The contact arrived at the residence and used a personal diagnostic reader and retrieved information related to misfires in cylinder #2 and #4. The contact replaced the spark plugs and the ignition coils. The contact test drove the vehicle, and the check engine warning light later illuminated. The contact swapped the ignition coils; however, the failure persisted. The vehicle was taken to the dealer where it was diagnosed that Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) had failed and caused the lifters to fail. The vehicle was not repaired due to the cost. The vehicle remained at the dealer unrepaired. The manufacturer was made aware of the failure but offered no assistance. The failure mileage was approximately 96,000.

The contact owns a 2015 GMC Yukon XL Denali. The contact stated while driving approximately 30-35 MPH, the engine and oil warning lights illuminated, and the contact pulled over. There was no indication of oil leaking on the ground. The contact had her son-in-law, an independent mechanic to check the oil and it was determined that the oil level was low. The contact stated that oil was added; however, three days later the oil level was low again. The vehicle was taken to the local dealer and the contact was notified of an excessive oil consumption failure. The vehicle was not repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline for assistance. The warranty company declined to repair the vehicle. The failure mileage was approximately 85,000.

The contact owns a 2015 GMC Yukon Denali. The contact stated that while driving at undisclosed speeds, the contact heard an abnormal grinding sound, and the transmission was shifting hard. While making a turn, there was an abnormal sound coming from the vehicle. There were unknown warning lights illuminated. The contact stated that the failure was related to NHTSA Campaign Number: 14V152000 (Power Train). The vehicle was taken to an independent mechanic, who informed the contact that the failure was due to the transmission. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 100,000. The VIN was not available.

The contact owns a 2015 GMC Yukon Denali. The contact stated while driving at approximately 20 MPH, the vehicle started decelerating with a slight clunking sound coming from underneath the front passenger’s side of the vehicle. The vehicle then lost motive power. The contact coasted to the side of the road and turned off the vehicle. After waiting for a while, the vehicle was started and the contact became aware that the instrument panel and all other electrical systems were activated as expected; however, the engine failed to start. The vehicle was towed to the dealer where it was diagnosed that there was a failure with the engine. The vehicle had not been repaired. The vehicle was then towed to an independent mechanic where it was confirmed that the engine had failed, and the starter needed to be replaced. The starter had been replaced; however, while starting the vehicle the engine emitted a loud rumbling noise which the dealer described as rocks being tossed around. The contact stated that the engine needed to be replaced. The vehicle was not repaired. The manufacturer had not been made aware of the failure. The failure mileage was 150,150.

The contact owns a 2015 GMC Yukon Denali. The contact stated that while driving at an undisclosed speed, the transmission was inoperable. The contact stated that when the gear shifter was shifted into reverse, the vehicle would drive forward. The contact also stated that when the gear shifter was in neutral, the vehicle would reverse instead. The vehicle was driven to the residence. The contact stated that the transmission fluid had leaked onto the ground. The vehicle was towed to an independent mechanic where it was diagnosed with a failed transmission. The contact was informed that the transmission needed to be replaced. The manufacturer was made aware of the failure and advised the contact to report the failure to the NHTSA Hotline. The failure mileage was approximately 102,000.

The contact owns a 2015 GMC Yukon Denali. The contact stated that the fuel tank was leaking fuel. The contact had not taken the vehicle to a certified mechanic or dealer to be diagnosed or repaired. The manufacturer was not made of the failure. The approximate failure mileage was 130,000.

The contact owns a 2015 GMC Yukon Denali. The contact stated that while driving the air condition system was blowing hot air and then became inoperable. There were no warning lights illuminated. The vehicle was taken to the local dealer where it was diagnosed and determined that the A/C condenser and A/C control module needed to be repaired. The vehicle was not repaired. The manufacture was not notified of the failure. The approximate failure mileage was 75,000.

The contact owns a 2015 GMC Yukon Denali. The contact stated that while his mother was driving approximately 50 MPH, the brake service warning light illuminated and the vehicle started to decelerate as if the brakes were engaged. The contact's mother was able to pull over safely and turned the vehicle off and on and was able to continue driving to her destination. The brake failure persisted. The contact had not taken the vehicle to a local dealer. The vehicle was not diagnosed or repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 115,000.

The contact owns a 2015 GMC Yukon Denali XL. The contact stated that while driving at an undisclosed speed, gasoline would leak out of the fuel tank. The vehicle was taken to the dealer; however, the vehicle was not diagnosed nor repaired. The manufacturer was made aware of the failure. The contact related the failure to TSB Number: 14858 (High-Pressure Fuel Pump). The failure mileage was approximately 126,000.

The contact owns a 2015 GMC Yukon Denali XL. The contact stated that the passenger’s side taillight failed to illuminate intermittently while depressing the brake pedal. Over time, the driver’s side taillight also would fail to illuminate with the brake pedal depressed. The contact then received a warranty notice from the local dealer about the failure however, the contact was informed when speaking to the dealer that due to the mileage on her vehicle, the vehicle no longer qualified under the warranty program. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 40,000.