GMC Yukon Denali XL loss of power problems

Filed Sep 7, 2022 · Electrical, Engine · 138,000 miles · CO

The contact owns a 2013 GMC Yukon Denali XL. The contact stated that while at a stop light, the vehicle suddenly started fluctuating while idling. The A/C was activated and the contact noticed that the vehicle was not being cooled inside the cabin. The contact stated that the failure recurred the following day. The contact stated that while attempting to make a right turn, the vehicle lost power steering functionality. The contact turned off the vehicle and shifted into park(P). The contact restarted the vehicle and the A/C unit independently turned off. Additionally, the vehicle regained power steering functionality and the vehicle idled as designed. The contact had not taken the vehicle to the dealer to be diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 138,000.

Filed Feb 21, 2019 · Electrical, Engine · 146,416 miles · CA

Tl* the contact owns a 2007 gmc yukon denali xl. While driving 70 MPH, the vehicle lost power and the engine power reduced message was displayed. In addition, the stability, ABS, and traction control indicators illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted and did not assist. The failure mileage was 146,416.

Filed Mar 12, 2018 · Electrical · 57,000 miles · CA

On 2/28/2018 I had just left the airport in oakland ca, approx 8:00pm. I stop for gas at the chevron station on 98th ave, after fueling, the car would not start. Reminder, this is a 2016 denali. I had a female associate with me and we had an appointment in san framsico at 8:30pm. The car had lost all power and two other people helped me push into adjacent parking space. The area is known for high crime, basically we were extremely nervous and stranded. Fortunately, we were able to contact aaa and set an appointment to check out the car. We ubered to our appointment. The failure of the battery left us vunrable and we both feared for our safety. The next day, the local mechanic said the battery should have lasted a minimum of seven years. They felt the battery wasn't sufficient to handle the electronics that were built into this car. Therefore, potentially creating a major safety concern with any owner of this vehicle. My complaint highlights the potential safety implications caused by the manufactures decision to reduce cost by installing a battery without the capacity to reasonably start the vehicle after only two years of use. I would hope all owners of this make and model are notified of this posiblity. I can't imagine any of my family members being exposed to this situation. Thank you!

Filed Jul 8, 2015 · Electrical, Engine · 123,000 miles · WA

Vehicle started fine, then as I was driving in neighborhood engine shut off and I lost all power, could not turn car without steering and crashed into curb up the street, car would not start, had aaa come tow to our home. Had a new battery, and would only take a charge when bypassing battery directly into engine. Now something is draining battery and if I don't start and run every two days , battery dead. Electrical cluster also going bad and instruments not working, air conditioning electrical problem , will blow cold out of all but two vents, where it blows 90 degrees. Back window wiper stopped working, all electrical related. Dealer said no error codes test drove for a week to get to reproduce stall driving, returned to me saying can't diagnose. So frustrating and dangerous.

Filed Feb 5, 2015 · Driver assistance, Electrical · 200,000 miles · WI

Vehicle went into reduced engine power and stabiltrak warning light came on. Reduced speed from 60 to 10mph. Now occurs on a regular basis.

Filed Nov 26, 2014 · Acceleration, Driver assistance · 117,568 miles · UT

This is twice that I've received the p2138 throttle body sensor code, which causes reduced engine power and has subsequent issues around stabilitrack/awd. The first time was in the middle of an intersection, we limped out of the intersection at 3 MPH. Today, my wife limped home from the store. This is extremely frustrating and should have been recalled a long time ago!!

Filed Nov 23, 2014 · Acceleration, Engine · 145,000 miles · WI · crash

Vehicle powers down without any pattern, rhyme or reason. It will do it at 5 MPH, and at 55 MPH, when driven a lot, and when not. Reduced engine power light turns on, vehicle suddenly slows to 25 MPH max, steering becomes hard, brakes too. Then will totally shut off immediately. I have replaced the battery, throttle body assembly and wiring harness twice. Fuses, fuel pump and filters, oil, and everything else as recommended. It put me in the ditch. It stranded me in the center of a freeway in winter. When it sits for a while, it resets, only to do it again. T/c light turns on also. I found out that I can manually reset the reduced engine power for a few moments (to get out of the center of the road) by turning the ignition switch on and off very fast. It is a extreme safety hazard! I haven't driven it in months due to absolute fear for my life. When its in reduced engine power mode, I can't get it to go above 25, and going up hills can't go above 5mph. If I am pulling a trailer, it starts to go backwards. This thing is going to kill someone! Please help

Filed Oct 5, 2014 · Driver assistance, Engine · 154,000 miles · CA

Hello over the last two weeks, my truck has had the following intermittent message flash across the dash "reduced engine power" and "stability system disabled", and the truck is limited to 25mph.. This has happened numerous times in traffic, forcing my wife, or myself to have to turn on the hazard lights and pull off the freeway as quickly as possible. After sitting for 5-10 minutes the lights will go off, and the engine will be fine. The described scenario just occurred again today for the 3rd time in one day,, so things appear to degrading rapidly, and I will need to have the system reviewed at the local dealership. I am very concerned as I have found a thread with numerous related concerns at edmunds,com (http://forums.edmunds.com/discussion/5759/gmc/yukon-denali/gmc-yukon-reduced-engine-power-message), and it does not appear that their is a valid recall for my VIN. I am not clear what may become of this complaint, but I am very concerned that my wife may be in a very dangerous situation if the engines keeps reducing power while driving on the freeway. Thank you for your time.

Filed Jul 8, 2014 · Driver assistance · 167,000 miles · OH

Was driving home from work and the truck lost power and did a sharp left with the steering and braking was low.

Filed Apr 1, 2014 · Driver assistance, Engine · 22,906 miles · MD

Traveling down the highway at 75 MPH. All of the sudden the stabilitrak system light went on followed by the truck shuddering and shaking fairly violently followed by the reduced engine power light going on and a very quick reduction in speed to approximately 35-40 MPH. Was able to pull over and tried to figure out what had just happened to a perfectly good running car. Attempted to reset the stabilitrak system using the gm manual page 5-6. No luck. Limped back onto the highway with a shaking truck with hazards on and made it to an exit . Went to gas station, turned off car again and filled with gas. Car was off for approximately 10 minutes while I ask for a gm dealership in town. Turned car on and the shaking had stopped and the power appeared to be normal. Went to gm. They hooked up to diagnostic machine . The code that came up was for a throttle position sensor replacement. Was covered under a special coverage adjustment, (12-6-2013) sent out to dealer service departments. Gm knows that this is a problem yet no one informed the drivers of these vehicles. My yukon denali xl was fixed . I am reporting this because I was put in a very dangerous position on the highway and high speeds. There is no doubt in my mind that without some good driving on my part and that of the 18 wheelers around me I could have caused an accident and injury. Once again gm knows this is a problem as stated in the #11273b special coverage adjustment- throttle position sensor replacement-december 16,2013. I would highly suggest that gm let car owners know so they can get the part replaced before killing or injuring themselves. I would not like my children or anyone else for that matter have this happen to them at any speed.