2018 GMC Sierra 1500 Engine Problems

NHTSA component category: ENGINE · data through 07/12/2026

62Engine complaints

21.2%Of all 293 complaints

#2Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How engine ranks on this vehicle

POWER TRAIN123 · 42%

ENGINE62 · 21.2%

ELECTRICAL SYSTEM40 · 13.7%

SERVICE BRAKES39 · 13.3%

STEERING29 · 9.9%

Share of the 293 complaints citing each category; one complaint can cite several. Full breakdown on the 2018 GMC Sierra 1500 overview page.

What owners report

“47,012 MILES RADIATOR FAILURE, LEAKING BADLY. GM DENIED REPAIR UNDER WARRANTY”NHTSA complaint 11435499 — filed 10/05/2021

“THE CONTACT OWNS A 2018 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE VIBRATED ABNORMALLY WHILE DRIVING. THE VEHICLE WAS TAKEN TO INGERSOLL AUTO…”NHTSA complaint 11407700 — filed 04/12/2021

“AT 55000 MILES THE RADIATOR STARTED TOO LEAK GM WOULD ONLY PAY 250.00 DOLLARS OF THE 876.00 IT COST”NHTSA complaint 11404196 — filed 03/22/2021

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Engine complaints by year filed

Frequently asked questions

Does the 2018 GMC Sierra 1500 have engine problems?

Engine is the #2 most-reported problem area on the 2018 GMC Sierra 1500: 62 of 293 complaints on file (21.2%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 2018 GMC Sierra 1500 have in total?

293 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 10 involved a crash, 1 involved a fire, 5 reported injuries, and none reported deaths.

What does NHTSA's engine category include?

NHTSA assigns each complaint to standard component categories; this page reports the ENGINE category exactly as NHTSA defines and records it.

About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/12/2026.