2018 GMC Terrain Electrical System Problems
NHTSA component category: ELECTRICAL SYSTEM · data through 07/12/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How electrical system 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
“Radio, hands free calling, and light on mirror shorting out. None of them work. Itâs like it has a short in the wiring.”NHTSA complaint 11469176 — filed 06/14/2022
“Multiple warning lights are appearing at once (Automatic brake assist, forward collision assist, parking brake released) When the car is put in reverse, the radio…”NHTSA complaint 11440697 — filed 11/16/2021
“WHEN RESTARTING AFTER VEHICLE "AUTO STOP" I AM GETTING "SERVICE BRAKE ASSIST" AND OCCASIONALLY "SERVICE ESC" WARNINGS. THESE WARNINGS WERE ASSOCIATED WITH BRAKE FAILURE IN…”NHTSA complaint 11397836 — filed 02/25/2021
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Electrical System complaints by year filed
Frequently asked questions
Does the 2018 GMC Terrain have electrical system problems?
Electrical System is the #4 most-reported problem area on the 2018 GMC Terrain: 33 of 212 complaints on file (15.6%). 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 07/12/2026. Across all categories, 14 involved a crash, 1 involved a fire, 12 reported injuries, and none reported deaths.
What does NHTSA's electrical system category include?
NHTSA assigns each complaint to standard component categories; this page reports the ELECTRICAL SYSTEM category exactly as NHTSA defines and records it.
