NHTSA Complaint #11660285 — 2021 GMC SIERRA 1500

POWER TRAIN issue reported to NHTSA

Check any vehicle history by VIN - Free vehicle history report

Complaint Details

ODI Number	11660285
Vehicle	2021 GMC SIERRA 1500
Component	POWER TRAIN
Date of Incident	April 25, 2025
Date Filed	May 11, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	NJ

Consumer Description

The engine coolant flow control valve position sensor is faulty. I brought mt truck in to my dealership and I have been waiting for over a month to get the issue fixed because “the part is on backorder”. This issue makes my truck sound like a jet engine because it makes the truck think overheating and causes the fan to come on at full blast. After drivinf for awhile it goes into “ reduced engine power mode” which is totally unsafe because it reduces the horse power to that of a lawn mower. It takes about 30 seconds to get from 0-60, so merging onto freeways or in conditions where you need extra speed its completely useless and increases the scenario of being rear ended, immensely.

Related Complaints for the 2021 GMC SIERRA 1500

Other POWER TRAIN Complaints

#11719556 — February 21, 2026 — I was driving on a highway on my way home from work. Thank god there was not a lot of traffic because my truck just s...

#11718623 — February 17, 2026 — I have had shuddering on the highway and a few hard random diwnshifts. Last week I went to start my truck and the tra...

#11716982 — February 10, 2026 — The engine has been burning oil since purchased but really highlighted when at 47k miles I got a dashboard message sa...

#11713162 — January 25, 2026 — 4 months after bring my truck back to the dealership for a body valve issue on the 10 speed transmission. The truck w...

#11712819 — January 22, 2026 — On the afternoon of 01/20/26, I was merging onto the highway in my 2021 GMC Sierra 1500 when a loud bang was heard fr...

Recent Complaints for the 2021 GMC SIERRA 1500

#11719556 — BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING — February 21, 2026 — I was driving on a highway on my way home from work. Thank god there was not a lot of traffic because my truck just s...

#11719556 — ENGINE — February 21, 2026 — I was driving on a highway on my way home from work. Thank god there was not a lot of traffic because my truck just s...

#11719314 — ENGINE AND ENGINE COOLING — February 20, 2026 — The contact owns a 2021 GMC Sierra 1500. The contact stated that while operating the vehicle, the check engine warnin...

#11718970 — ENGINE — February 18, 2026 — The failed component is the engine coolant control valve on a 3.0L Duramax truck. The failure has been documented and...

#11717579 — ENGINE — February 12, 2026 — Had a P1098 code. The truck was diagnosed by a certified technician. Found to have a failing coolant control valve....