2015 GMC Sierra Denali Brakes Problems
- Complaints
- 7about this part
- Share
- 32%of 22 total for the year
- Median mileage
- 49,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 7 complaints about the brakes of the 2015 GMC Sierra Denali, 32% of the 22 complaints for this model year. Where a mileage was given, the median is 49,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“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. …”
NHTSA complaint #11385689, filed 2020-12, 30,000 miles“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”
NHTSA complaint #11308038, filed 2020-02, 39,500 miles“Failure of the belt driven vacuum pump while driving causing very hard braking and almost caused an accident. Vacuum pressure dropped off and caused the pedal to become firm. Luckily after it was inspected for repair there wasn't oil contamination in the vacuum line or brake booster so those did not have to be replaced.”
NHTSA complaint #11160832, filed 2018-12, 70,135 miles“Hard brake pedal. At low speed the brake pedal gets really hard and makes it hard to stop the truck. Pedal has to get pushed really hard to barely stop from hitting other vehicles. Ongoing issue.”
NHTSA complaint #11066885, filed 2018-02, 56,000 milesRelated service bulletins
- 11017173Mar 21, 2025This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- 11014230Jan 31, 2025This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
- 11011709Nov 5, 2024This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
- 10242252Aug 18, 2023This technical bulletin provides information and a solution to a condition of Brake Pedal Moves or Self Applies at Full Turns.
Brakes: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2020 | 2 | 18% |
| 2019 | 8 | 31% |
| 2018 | 4 | 24% |
| 2016 | 8 | 27% |
| 2015 | 7 | 32% |
| 2014 | 4 | 29% |
| 2012 | 2 | 20% |
| 2008 | 1 | 6% |
| 2006 | 2 | 40% |
| 2004 | 5 | 45% |
| 2002 | 10 | 77% |
Other parts of the 2015 GMC Sierra Denali
5 complaintsElectrical system
3 complaintsOther or unknown
2 complaintsAir bags
1 complaintsEngine
1 complaintsEngine cooling
1 complaintsFuel system
1 complaintsSeats
1 complaintsSteering
1 complaintsBody and structure
1 complaints
← All problems reported for the 2015 GMC Sierra Denali
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology