2026 GMC Sierra 1500 Transmission & Power Train Problems
NHTSA component category: POWER TRAIN · data through 11/01/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How power train ranks on this vehicle
Share of the 147 complaints citing each category; one complaint can cite several. Full breakdown on the 2026 GMC Sierra 1500 overview page.
What owners report
“The contact owns a 2026 GMC Sierra 1500. The contact stated that while hauling a trailer and making a left turn at 5 MPH, at…”NHTSA complaint 11764703 — filed 09/16/2026
“The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission independently shifted to park or…”NHTSA complaint 11761844 — filed 09/03/2026
“I bought the vehicle brand new in april 2026. On May 3rd, approximately 2 weeks after I bought it, I experienced a lifter failure that…”NHTSA complaint 11759298 — filed 08/25/2026
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2026 GMC Sierra 1500 have transmission & power train problems?
Power Train is the #2 most-reported problem area on the 2026 GMC Sierra 1500: 35 of 147 complaints on file (23.8%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2026 GMC Sierra 1500 have in total?
147 complaints were on file with NHTSA as of 11/01/2026. Across all categories, 1 involved a crash, 0 involved a fire, 0 reported injuries, and none reported deaths.
What does NHTSA's power train category include?
NHTSA groups complaints about the transmission (automatic or manual), driveline, axles, transfer case and related parts under a single component category called POWER TRAIN. This page reports that category as NHTSA defines it.
