2012 GMC Sierra 2500HD: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 9 owner complaints for the 2012 GMC Sierra 2500HD that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11541273 (filed 08/28/2023): “Truck is a diesel. fuel pump blew up and died in the middle of the street. now i'm being told the fuel system needs completely re done and will cost me 10g. i also found a lawsuit for this issue as well.…”
- NHTSA complaint ODI #11366632 (filed 10/27/2020): “While traveling on the interstate at speed and passing slower traffic; engine power fell off, change fuel filter now, engine derate, and check engine lite, occured. i had to maneuver with no power through the traffic to get out of the travel lanes. i was then stranded on the interstate as the truck …”
- NHTSA complaint ODI #11022589 (filed 09/11/2017): “Emissions failure. nox sensor, def system. driving, display states, poor def quality. took in for repair, still def quality. truck has slowed to 55mph, will slow to 4 mph in 39 miles. they are trowing parts at it at my expense. can't properly diagnose. this problem is from 2010- current models of th…”
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.
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