2023 GMC Sierra 1500: Engine complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 229 owner complaints for the 2023 GMC Sierra 1500 that list the engine component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11770410 (filed 10/11/2026): “1) driving on highway and lost acceleration power would only go 50 mph/went into limp mode. dealership stated vin number had not been released into national safety recall. replaced crank shaft valve and was told once vin was released i would be reimbursed, to date still in dispute. 2) low oil light …”
- NHTSA complaint ODI #11767315 (filed 09/28/2026): “6.2l engine lost power and failed at highway speed with no warning lamp or prior indication of failure. engine recall/pico test and oil viscosity change performed by dealer at 40,000 miles. engine failed at 45,868 miles.…”
- NHTSA complaint ODI #11766541 (filed 09/23/2026): “Code p1098 came up today 80k on the truck. coolant control valve failure. second time this has failed, first at 45k. speed reduction activated.…”
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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