2016 GMC Sierra 1500: Rough idle
Common wear/failure (not a recall)
Symptoms
Owners of the 2016 Sierra 1500 report: rough idle. CarComplaints.com lists 5 owner complaints, average mileage 55,250 miles.
NHTSA has 7 owner complaints for the 2016 Sierra 1500 in this area. Examples:
- NHTSA complaint ODI #11770275 (filed 10/10/2026): “Transmission was replaced about 13 months or so after purchasing and was already out of warranty.…”
- NHTSA complaint ODI #11756191 (filed 08/11/2026): “The vehicle stopped dead in traffic and would not restart. no warning lights. this is a huge safety hazard. had to be towed to a dealership. the dealership and other diesel shops said the issue is a known catastrophic cp4 fuel pump failure. the fuel pump shre…”
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: replaced motor mounts (1 reports) valve job (1 reports). 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
CarComplaints.com owners report a typical repair cost of about $3,270 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
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