NHTSA Complaint #11691992 — 2020 GMC SIERRA 3500 ENGINE

Complaint Details

ODI Number	11691992
Vehicle	2020 GMC SIERRA 3500
Component	ENGINE
Date of Incident	August 28, 2025
Date Filed	October 8, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	WA

Consumer Description

the engine seized at 65mph. available for inspection. was left stranded in a limited access area with no cell service. there was no warning, the engine just stopped at highway speed and would not restart. the problem was confirmed by an independent service center. they couldnt identify which component had failed without a costly teardown. occurred at 112,000 miles, past the 100,000 mile powertrain warranty.

Related Complaints for the 2020 GMC SIERRA 3500

Other ENGINE Complaints

#11662257 — May 21, 2025 — Engine started skipping, then service parking brake light came on, then service engine light came on and speed droppe...

#11639548 — January 30, 2025 — Engine Coolant Low error constantly appears. GM Service provider states that engine coolant level is fine, but sensor...

#11627460 — November 26, 2024 — The contact owns a 2020 GMC Sierra 3500. The contact stated while driving approximately 60 MPH, the vehicle jerked, l...

#11493546 — November 14, 2022 — Plugged in engine block heater and the car erupted in flames. Total loss.

#11418621 — May 26, 2021 — The computer lights up the dash reducing power and turning off power to trailer brakes. This has almost caused an ac...

Recent Complaints for the 2020 GMC SIERRA 3500

#11712433 — ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:UREA INJECTION SYSTEM (DEF) — January 21, 2026 — Diesel exhaust fluid tank heater malfunctioned and meted tank and connectors.

#11712433 — UNKNOWN OR OTHER — January 21, 2026 — Diesel exhaust fluid tank heater malfunctioned and meted tank and connectors.

#11693845 — STRUCTURE:BODY — October 16, 2025 — Known defect with 2019 and now 2020 GMC sierra trucks. Design was updated for 2021+ which has corrected the seal fail...

#11672242 — POWER TRAIN — July 9, 2025 — The contact owns a 2020 GMC Sierra 3500. The contact stated that while driving at an undisclosed speed, the vehicle i...

#11672009 — POWER TRAIN — July 8, 2025 — The contact owns a 2020 GMC Sierra 3500. The contact stated that while driving at 60 MPH, the rear differential seize...