2018 GMC Sierra 1500 Electrical System Problems
NHTSA component category: ELECTRICAL SYSTEM · data through 09/08/2026
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 300 complaints citing each category; one complaint can cite several. Full breakdown on the 2018 GMC Sierra 1500 overview page.
What owners report
“Im getting a service trailer brake system soon message on dash.”NHTSA complaint 11447033 — filed 01/11/2022
“The contact owns a 2018 GMC Sierra 1500. The contact stated while driving approximately 70 MPH, the trailer wiring harness system warning message was illuminated…”NHTSA complaint 11446497 — filed 01/06/2022
“At 50,000 miles the "service trailer brake system" error message appears constantly due to factory defects and its very common. These trucks should be recalled…”NHTSA complaint 11446097 — filed 01/04/2022
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 Sierra 1500 have electrical system problems?
Electrical System is the #3 most-reported problem area on the 2018 GMC Sierra 1500: 41 of 300 complaints on file (13.7%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2018 GMC Sierra 1500 have in total?
300 complaints were on file with NHTSA as of 09/08/2026. Across all categories, 10 involved a crash, 1 involved a fire, 5 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.
