2018 GMC Sierra 2500HD: Tran wont engage in freezing temperatures
Common wear/failure (not a recall)
Symptoms
Owners of the 2018 Sierra 2500HD report: tran wont engage in freezing temperatures. CarComplaints.com lists 1 owner complaints, average mileage 130,500 miles.
NHTSA has 3 owner complaints for the 2018 Sierra 2500HD in this area. Examples:
- NHTSA complaint ODI #11474048 (filed 07/15/2022): “2018 gmc sierra 2500. consumer writes in regard to transmission cooler lines recall. the consumer stated the vehicle began leaking fluid. the vehicle was taken to the dealer to have the vehicle repaire, which could not be done the same day. the consumer was s…”
- NHTSA complaint ODI #11289536 (filed 12/16/2019): “While trying to merge onto the insterstate my truck started lost power and started to chug. my truck slowed drastically which caused a tractor/trailer to almost run into the back of me. this has been an ongoing issue that my dealership has addressed by refla…”
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
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 $1,000 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
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