2015 GMC Yukon Denali

73 complaints on file, page 1 of 4.

1. Filed Aug 13, 2025Failure Jul 23, 202596,000 milesSan Antonio, TXEngine and engine cooling

   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.

   NHTSA complaint 11680375
2. Filed Oct 28, 2024Failure Jan 14, 2021100,000 milesDanville, ILPower train

   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.

   NHTSA complaint 11622331
3. Filed Sep 5, 2024Failure Sep 1, 2024150,150 milesRichmond, VAEngine

   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.

   NHTSA complaint 11612810
4. Filed Feb 16, 2024Failure Feb 15, 2024102,000 milesKyle, TXPower train

   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.

   NHTSA complaint 11572365
5. Filed Jul 28, 2022Failure Jul 14, 2022130,000 milesSuwanee, GAFuel system, Tank assembly

   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.

   NHTSA complaint 11476364
6. Filed Apr 29, 2022Failure Jun 1, 202175,000 milesConcrete, WAElectrical system

   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.

   NHTSA complaint 11462781
7. Filed Mar 28, 2022Failure Aug 13, 2018115,000 milesSomerset, NJService brakes

   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.

   NHTSA complaint 11458720
8. Filed Jan 26, 2020Failure Aug 1, 201960,000 milesKingston, TNElectrical system

   TAIL LIGHTS SOMETIMES WORK AND MOST OF THE TIME DOES NOT WORK. I SEE HUNDREDS OF COMPLAINTS ABOUT THIS AND NOTHING IS BEING DONE ABOUT IT! THIS WILL BE MY FIRST AND LAST TIME BUYING A GMC CAR. THIS IS VERY DANGEROUS AND A VERY EXPENSIVE PROBLEM TO HAVE!

   NHTSA complaint 11302141
9. Filed Aug 21, 2019Failure Jul 1, 201964,000 milesPhoenix, AZElectrical system, Brake lights

   TL* THE CONTACT OWNS A 2015 GMC YUKON DENALI. WHILE REVERSING THE VEHICLE, THE CONTACT WAS INFORMED THAT THE BRAKE LIGHTS WERE NOT ILLUMINATING. HOWEVER, WHEN THE VEHICLE WAS IN DRIVE, THE BRAKE LIGHTS ILLUMINATED. ALSO, WHEN THE CONTACT DEPRESSED THE BRAKE PEDAL TO SLOW OR STOP THE VEHICLE, THE BRAKE LIGHTS DID NOT ILLUMINATE. THE CONTACT CALLED COULTER BUICK GMC PHOENIX (1202 E CAMELBACK RD, PHOENIX, AZ 85014, (602) 396-5994) AND WAS INFORMED THAT THERE WERE NO RECALLS. THE DEALER REFERRED THE CONTACT TO THE MANUFACTURER. THE MANUFACTURER WAS NOT CONTACTED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE FAILURE MILEAGE WAS 64,000.

   NHTSA complaint 11245472
10. Filed Jul 22, 2019Failure Jul 22, 201949,000 milesHerriman, UTExterior lighting

    TAIL LIGHT CIRCUIT (LED INTERNAL TO HOUSING) CRACKS, CAUSING RAIL/BRAKE LIGHT OUTAGE WITH NO WARNINGS ON THE DASH FOR THE DRIVER. THIS IS A MATERIAL DEFECT IN THE METAL STAMPING USED FOR THE LED POWER CIRCUIT. EXACERBATED BY HEAT AND VIBRATION.

    NHTSA complaint 11234010
11. Filed Jul 22, 2019Failure Apr 20, 2018119,000 milesGolden, COExterior lighting

    THE PASSENGER SIDE BRAKE/TAIL LIGHTS INTERMITTENTLY DO NOT WORK. THEY WORK ABOUT 60 PERCENT OF THE TIME AND THE OTHER 40 PERCENT THEY DO NOT. I HAVE READ MANY COMPLAINTS ONLINE ABOUT THIS ISSUE AND GM NEEDS TO STEP UP AND GET IT FIXED. IT IS A SAFETY ISSUE.

    NHTSA complaint 11234002
12. Filed Jul 19, 2019Failure Jul 9, 201988,000 milesMableton, GAExterior lighting

    BRAKE/TAIL LIGHTS HAVE GONE OUT. MY CAR ISN'T EVEN 5 YEARS OLD. THE REPAIR IS ASTRONOMICAL'AT LEAST $1500!!!

    NHTSA complaint 11233328
13. Filed Jul 15, 2019Failure Mar 21, 201982,301 milesAllendale, SCExterior lighting

    MY DRIVER'S SIDE TAIL LIGHT FLICKERED FOR ABOUT 2 MONTHS BEFORE FINALLY GOING OUT. THE OTHER SIDE IS NOW DOING THE SAME THING. IT HAS 82,301 MILES ON IT.

    NHTSA complaint 11232044
14. Filed Jul 12, 2019Failure Jul 12, 2019Spartranburg, SCExterior lighting

    I HAVE BEEN HAVING ISSUES FOR ABOUT A YEAR WITH THE LIGHTS WORKING INTERMITTENTLY. AS OF TODAY, JUNE 12 2019, THEY ARE OUT COMPLETELY!!!! AFTER GOING TO A LOCAL MECHANIC HE SAID THE WHOLE CIRCUIT WAS GONE & WOULD HAVE TO BE REPLACED!!! I AM IN BETWEEN JOBS AND DO NOT HAVE 2000.00 DOLLARS TO FIX SAID PROBLEM. I HAVE FOUND SEVERAL MESSAGE BOARDS WHO HAVE ALL HAD THE SAME PROBLEM WITH NO HELP WHAT SO EVER FROM GMC!!!!! THIS IS RIDICULOUS. WHEN YOU MAY THOUSANDS OF DOLLARS FOR A SUV YOU EXPECT IT TO LAST LONGER THAN 88,000!!! THIS ISN'T THE FIRST PROBLEM I HAVE HAD WITH THIS SUV. SO THIS NEEDS TO BECOME A RECALL ISSUE AND GMC OR THE PART SUPPLIER NEEDS TO FIX THIS.

    NHTSA complaint 11231410
15. Filed Jun 28, 2019Failure Jun 28, 201960,000 milesFT Collins, COElectrical system, Exterior lighting, Service brakes

    THE LEFT BRAKE LIGHT FAILED WITH 57K MILES. THE RIGHT ONE THEN FAILED AT 61K MILES. THE DEALER WANTED $735 EACH TO FIX THEM, AS THEY CLAIM THEY NEED TO REPLACE THE ENTIRE LED HOUSING. THE DEALER IS WELL-AWARE THAT THIS IS A COMMON PROBLEM, AND IT WOULD APPEAR BASED ON GOOGLING THE ISSUE THAT MANY OTHERS HAVE EXPERIENCED THIS FAILURE FROM GM.

    NHTSA complaint 11228279
16. Filed Jun 20, 2019Failure Jun 19, 201979,865 milesAssonet, MAExterior lighting

    THE TAIL LIGHT FAILED WITH NO PHYSICAL DAMAGE. I FEEL THIS IS A LATENT DEFECT THAT GM IS AWARE OF BUT WILL NOT TAKE RESPONSIBILITY FOR IT. THIS A SEALED UNIT CAUSING OWNERS TO PAY EXORBITANT AMOUNTS TO REPLACE THE UNIT. THERE ARE MANY REPORTS OF THIS ITEM FAILING IN THE FIELD WITHIN AN UNACCEPTABLE TIME PERIOD. PRODUCTION DATE ON OUR UNIT IS APR/24/14, SO JUST OVER A FIVE YEAR PERIOD ON A VEHICLE WITH LESS THAN 80K MILES.

    NHTSA complaint 11221424
17. Filed May 16, 2019Failure May 16, 2019102,000 milesNoble, OKExterior lighting

    WE PURCHASED A USED 2015 YUKON DENALI LESS THAN 6 MONTHS AGO AND BOTH TAIL LIGHTS HAVE NOW GONE OUT. AFTER READING ABOUT THE ISSUE, IT SEEMS LIKE THIS IS A VERY COMMON ISSUE WITH LIGHTS ON THIS VEHICLE. VERY UNFORTUNATE THAT GMC REFUSES TO DO ANYTHING ABOUT IT.

    NHTSA complaint 11207958
18. Filed Apr 29, 2019Failure Apr 1, 2019Talbott, TNElectrical system

    DRIVERS SIDE LED TAILLIGHT STOPPED WORKING AND THE WHOLE ASSEMBLY HAS TO BE REPLACED AT $800. LED'S SHOULD LAST LIFE OF THE VEHICLE THAT IS WHY YOU CAN'T JUST REPLACE A BULB. I HAVE READ HUNDREDS OF POSTS WITH THE SAME ISSUE. GM SHOULD DO A RECALL OR OFFER A STEEP DISCOUNT ON THE REPLACEMENT.

    NHTSA complaint 11204411
19. Filed Apr 8, 2019Failure Apr 1, 2019Ocean Springs, MSExterior lighting

    TAILLIGHTS WORKING INTERMITTENT. THIS IS A SAFETY ISSUE. I HAVE GOOGLE AND THERE OVER A 100 COMPLAINTS ON CAR GURUS WITH THE SAME PROBLEM. THIS IS A GMC SAFETY PROBLEM. THESE YUKON'S ARE EXPENSE AND I SHOULD FEEL SAFE WHILE DRIVING IT. TAKING IT TO THE DEALERSHIP THIS MORNING. I AM ASKING A CUSTOMER OF GMC--- DO THE RIGHT THING AND LOOK INTO THIS AS SOMEONE IS GOING TO GET KILLED - NO TAILLIGHTS COULD BE A LIFE THREATING SAFETY ISSUE. GMC DO THE RIGHT THING. LOOK AT ALL OF THE COMPLAINTS WITH THE EXACT SAME ISSUE

    NHTSA complaint 11194525
20. Filed Apr 5, 2019Failure Apr 2, 201940,000 milesYuma, AZExterior lighting

    THE REAR DRIVER SIDE TAILLIGHT DOES NOT WORK. TOOK IT TO THE DEALERSHIP AND THEY SAID IT WAS A PROBLEM THEY SAW FREQUENTLY, TO JUST HIT THE LIGHT AND IT MIGHT START WORKING. OTHERWISE IT WAS A 800 DOLLAR LIGHT TO REPLACE....IF IT IS A FREQUENT PROBLEM GMC SHOULD BE FIXING IT... ARE THEY GOING TO PAY FOR A TICKET IF I GET PULLED OVER OR WORSE SOMEONE CRASHES INTO ME? THE PROBLEM COMES AND GOES BUT HAS SEEMED TO GET WORSE AND IS NOT SAFE OR LEGAL TO DRIVE WITH THE LIGHT HOW IT IS. BAD DESIGN OF THE LIGHT. AND FROM WHAT I HAVE SEEN ONLINE I AM NOT THE ONLY ONE. THERE A WHOLE FORUMS THAT PEOPLE HAVE THE SAME ISSUE.

    NHTSA complaint 11194118