2015 GMC Sierra Denali Engine Problems
- Complaints
- 1about this part
- Share
- 5%of 22 total for the year
- Median mileage
- 46,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 1 complaints about the engine of the 2015 GMC Sierra Denali, 5% of the 22 complaints for this model year. Where a mileage was given, the median is 46,000 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.
“My Gmc 2015 diesel durimax truck had the engine light turn on and said emission needs serviced. It proceeded to cut my traveling speed from 75 MPH to 65 MPH to 55 MPH. I made it to denver colorado barely without the truck falling to 4 MPH. I went yesterday to have it serviced. They said that they fixed it still under powertrain warranty. I drove away to go back to texas 700 miles of highway home. I drove and the exact same problem happened again. I'm was on a highway at this point with heavy highspeed traffic in the middle of nowhere where the speed limit is 75 MPH. …”
NHTSA complaint #11002748, filed 2017-07, 46,000 milesRelated service bulletins
- 11026017Jun 5, 2025This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
- 11024485May 15, 2025The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the…
- 11020254May 7, 2025This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in…
- 11017263Mar 25, 2025This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to…
- 11016942Mar 4, 2025This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to…
- 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.
- 11014233Jan 30, 2025This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large…
- 11013069Jan 9, 2025This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- 11012907Dec 18, 2024This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
- 11011900Nov 22, 2024This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
Engine: other model years
Other parts of the 2015 GMC Sierra Denali
7 complaintsTransmission and drivetrain
5 complaintsElectrical system
3 complaintsOther or unknown
2 complaintsAir bags
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 30, 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