2018 GMC Sierra 1500: Power Train complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 131 owner complaints for the 2018 GMC Sierra 1500 that list the power train component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11770114 (filed 10/09/2026): “My 2018 gmc sierra 1500 experienced significant transmission problems that began as rough, inconsistent shifting, hesitation, and abnormal transmission behavior before eventually progressing to complete transmission failure. these symptoms were present before the transmission's ultimate failure and…”
- NHTSA complaint ODI #11765024 (filed 09/17/2026): “Vehicle purchased certified pre-owned in october of 2021 with roughly 43,000 miles. during the first service (47,598 miles) at a gm dealer i reported very hard shifts, but this issue was ignored during service. at the next servce (54,571 miles) i again reported the hard shifts and "surging" when c…”
- NHTSA complaint ODI #11764851 (filed 09/16/2026): “Unknown…”
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
Diagnosis needs a scan tool; repair or replacement needs a lift, transmission jack and the manufacturer's fluid fill/relearn procedure. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
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