2023 GMC Sierra 1500: Diesel engine has a misfire on cold starts and warm start
Common wear/failure (not a recall)
Symptoms
Owners of the 2023 Sierra 1500 report: diesel engine has a misfire on cold starts and warm start. CarComplaints.com lists 1 owner complaints, average mileage 21,000 miles.
NHTSA has 229 owner complaints for the 2023 Sierra 1500 in this area. 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 …”
- 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.…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: none clearly reported. Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
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: get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
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