2018 GMC Terrain Transmission & Power Train Problems
NHTSA component category: POWER TRAIN · data through 07/14/2026
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 212 complaints citing each category; one complaint can cite several. Full breakdown on the 2018 GMC Terrain overview page.
What owners report
“I have a 2018 GMC TERRAIN which I bought brand new from General Motors. In May 2022, the vehicle started jerking/hoping and trying to stall…”NHTSA complaint 11474593 — filed 07/18/2022
“When you're sitting at idle in gear and go to accelerate the transmission will slip out of gear into neutral then into gear after the…”NHTSA complaint 11462183 — filed 04/26/2022
“11/24/2021 buy 2018 GMC Terrain, before leaving the dealership I told the seller that the engine light was on he said it was because they…”NHTSA complaint 11447628 — filed 01/15/2022
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2018 GMC Terrain have transmission & power train problems?
Power Train is the #3 most-reported problem area on the 2018 GMC Terrain: 40 of 212 complaints on file (18.9%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2018 GMC Terrain have in total?
212 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 14 involved a crash, 1 involved a fire, 12 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.
