The contact owns a 2015 GMC Sierra 2500 Denali. The contact stated that while driving at 65 MPH, the vehicle lost motive power with the “Engine Power Failure” warning light illuminated. The vehicle was towed to the residence. The vehicle was later towed to an independent mechanic, where it was diagnosed and determined that the fuel system had failed and there were metal shavings in the fuel system. The contact was informed that the fuel system needed to be replaced. The vehicle was not repaired. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the federal safety agency Hotline for assistance. The approximate failure mileage was 160,000.
The worst 2015 GMC Sierra Denali problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Brakes7
- Transmission5
- Electrical3
- Engine2
- Airbags1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Brakes7
- Transmission5
- Electrical3
- Engine2
- Airbags1
- Body1
- Fuel system1
- Seats1
- Steering1
Recalls
No recalls on record for this model year.
Defect investigations
Desiccated Air Bag Inflator Rupture
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.
EA21002
Technical service bulletins for the 2015 GMC Sierra Denali 1,816
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Unknown or other
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- Unknown or other
- PI to help diagnose A/C concern
- Unknown or other
- Unknown or other
- Unknown or other
- New Vehicle Monitoring Programs Section in IVH
- Unknown or other
- This service bulletin provides information on Tire Sidewall Irregularities.
What 2015 GMC Sierra Denali owners say
Most recent owner complaints, unedited.
See attached document for complaint.
The contact owns a 2015 GMC Sierra 1500 Denali. The contact stated that while shifting the vehicle from park(P) to drive(D), the vehicle hesitated and then jerked into gear. The contact stated that the entire vehicle was shaking when it jerked into gear. The contact stated that the failure was also occurred while shifting the vehicle into reverse(R). Additionally, the failure occurred while slowing down for a traffic signal. The contact stated that the failure was a constant. The contact stated she had not noticed any warning lights during the failure. The contact had taken the vehicle to a local dealer who advised the contact that there were no open recalls for the transmission on the VIN. The vehicle was not diagnosed. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was unknown.
4 months ago the display portrayed a message stating, trailer brake warning, have system checked. Since that time I have attempted on numerous to have my vehicle checked. But as of this date I have not been to have any dealership look at my vehicle. I have been told by dealership that the vehicle computer shows a history but no current error codes, and they can not work on vehicle until it has current codes. So I have a truck that is designed to tow cargo/vehicle but I am not able to use my truck for that purpose because of this warning message. I have contacted dealerships, customer service with gmc and even filed a complaint with tennessee dept of consumer affairs, but no one wants to help with my problem. I have noticed on the internet that I am not the only one with this issue. Dangerous situation should someone use vehicle towing. Biggest problem gm does not want to even acknowledge that they have a problem.
Ac blows hot air qont gold freon for longer then week and half and is back to hot air..lead to believe its the AC condenser has failed
I was backing up at very low speed the brake pedal got very hard and the vehicle acted like it did not want to stop I had to keep pushing extremely hard on to the break to get the vehicle to stop I tried it again in drive and the vehicle did this exact same thing this time I noticed after paying particular attention that the brakes while they were hard to press were pulsating so I had to use extreme leg pressure to stop the vehicle. My truck has already had the recall for the same issue earlier this year. When this 1st happened it almost caused me to wreck into a fence
Transmission is not able to be fixed. Three repairs and gm can't fix. Transmission jerks, slips, clunks. Uncomforable to drive. I am stuck with subpar vehicle. Gm has been horrible to work with. 17 recalls? Why cant gm make a solid reliable vehicle after 100 years in business?
Hard brake pedal with increased effort needed to depress the brake pedal. Feels like truck will not stop. Had to have truck towed. Reported back on 11-24-18 to the federal safety agency: ( #1115347). Brake vacuum pump was replaced @ gm dealer on 11-14-18, same situation happened again on 02-19-19. Gm tsb # pit5361d needs to be a recall.
When coming to a stop, applying a steady amount of brake pressure the transmission shifts and loses all forms of engine braking causing the truck to speed up and overshoots the stopsign.
Poor brake performance. The brake pedal gets stiff at a low speed and causes the truck to not brake completely
Compare the 2015 GMC Sierra Denali
Other model years
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Questions about the 2015 GMC Sierra Denali
Is the 2015 GMC Sierra Denali reliable?
Owners have filed 22 complaints about the 2015 GMC Sierra Denali, 1.7 times a typical Sierra Denali model year.
What is the 2015 GMC Sierra Denali year score?
The 2015 GMC Sierra Denali scores 56 out of 100 (below average). The score compares it with the other model years of the GMC Sierra Denali: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2015 GMC Sierra Denali?
Brakes, with 7 complaints, typically around 49,000 miles. Next is transmission (5).
How many recalls does the 2015 GMC Sierra Denali have?
No recalls on record.
VIN decoder
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