2025 GMC Sierra 1500: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 57 owner complaints for the 2025 GMC Sierra 1500 that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11768518 (filed 10/02/2026): “Electronic braking system failure. vehicle was put in limp mode with a top speed of 62 mph. vehicle had very little or no braking . vehicle has less than 13,000 miles . i am the original owner.…”
- NHTSA complaint ODI #11765016 (filed 09/17/2026): “The contact owns a 2025 gmc sierra 1500. the contact stated that while driving approximately 5 - 10 mph, the vehicle went into limp mode and failed to properly accelerate, and the transmission unexpectedly downshifted. there was an electrical malfunction, which caused the transmission to downshift. …”
- NHTSA complaint ODI #11763207 (filed 09/09/2026): “When updating the vehicle as prompted by the entrainment system the next day when attempting to start the vehicle it did not start. vehicle had to be jumped then 6 warning lights came on and disappeared shortly after driving.…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto