2018 GMC Sierra 1500: Shuddering
Common wear/failure (not a recall)
Symptoms
Owners of the 2018 Sierra 1500 report: shuddering. CarComplaints.com lists 5 owner complaints, average mileage 33,400 miles.
NHTSA has 131 owner complaints for the 2018 Sierra 1500 in this area. 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…”
- 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 repor…”
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: triple flush and new fluid (2 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
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
CarComplaints.com owners report a typical repair cost of about $350 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
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