NHTSA ID Number: 11710159
Incident Date: 2024-11-28
Manufacturer's Name: General Motors
, LLC
Vehicle/Equipment Make: GMC
Vehicle/Equipment Model: SIERRA 1500
Model Year: 2021
9999 If Unknown Or N/A
Vehicle Identification Number: 3GTU9DET3MG
Vehicle Mileage At Failure:
Vehicle Speed: 50
Number Of Occurrences:
Was Vehicle Towed: No
Consumer Location: Stoneboro, PA
Summary of Complaint
Unexpected rear wheel lock-up at 29000 miles. While engine braking from highway speed onto an off-ramp at approximately 50 mph, the rear wheels unexpectedly locked up. Due to prior rear brake actuator issues, I suspected the emergency brake had activated without my input. It was only momentary, and no fault codes or warnings were displayed. It happened again under the same circumstances two months later, with no fault codes. On May 9, 2025, the check engine light came on, and I scheduled service. The dealer addressed a recall regarding the transmission by installing software. In August 2025, I received a letter from GM regarding recall N242454440 for excessive wear in the transmission control valve, which was causing rear-wheel lockup. On October 31, 2025, while towing a small enclosed trailer at 70 mph on the highway with cruise control engaged, the truck suddenly decelerated, and I was nearly rear-ended by a semi-truck (no brake lights to warn them). The truck would not go over 50 mph unless I was going downhill. The transmission would not shift into higher gears. I returned it to the dealer, who checked the computer and found no record of the incident, so they said there was no problem. They informed me that the new software was designed to limit the truck's speed if a potential lockup was detected. This recall did not fix the transmission problem or the safety issue. It was simply a way to avoid costly repairs. There is a problem with the physical transmission valve that, for me, resulted in an extremely dangerous situation. The NHTSA needs to take this issue seriously and require GM to replace the prematurely worn valves in the affected vehicles.
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Complaint 11710159 Documents
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CRASH: No
WAS VEHICLE INVOLVED IN A CRASH
FIRE: No
WAS VEHICLE INVOLVED IN A FIRE
INJURIES: 0
NUMBER OF PERSONS INJURED
DEATHS: 0
NUMBER OF FATALITIES
Was Medical Attention Required: No
Was Incident Reported To Police: No
Date Of Incident: 2024-11-28
(YYYY-MM-DD)
Date Added To File: 2026-01-10
(YYYY-MM-DD)
Date Complaint Received By NHTSA: 2026-01-10
(YYYY-MM-DD)
Date Purchased:
(YYYY-MM-DD)
Was Original Owner: No
Product Type: Vehicle
V = Vehicle T = Tires E = Equipment C = Child Restraint
Specific Component's Description: POWER TRAIN
Anti-Lock Brakes: No
Cruise Control: No
Number Of Cylinders:
Drive Train Type:
[AWD, 4WD, FWD, RWD]
Fuel System:
FI = Fuel Injection TB = Turbo
Fuel Type:
BF = BiFuel CN = CNG/LPG DS = Diesel GS = Gas HR = HybridElectric
Vehicle Transmission Type [Auto, Man]:
(DOT) Department Of Transportation Tire Identifier:
Tire Size:
Location Of Tire:
FSW = Driver Side Front DSR = Driver Side Rear FTR = Passenger Side Front PSR = Passenger Side Rear SPR = Spare
Type Of Tire Failure:
BST = Blister BLW = Blowout TTL = Crack OFR = Out Of Round TSW = Puncture TTR = Road Hazard TSP = Tread Separation
Was Defective Tire Repaired:
Was Part Original Equipment:
Date Of Manufacture:
(YYYYMMDD)
Type Of Child Seat:
B = Booster C = Convertible I = Infant IN = Integrated TD = Toddler
Installation System:
A = Vehicle Safety Belt B = Latch System
Dealer's Name:
Dealer's Telephone Number:
Dealer's City:
Dealer's State:
Dealer's Zipcode:
SOURCE OF COMPLAINT CODE:
CAG = Consumer Action Group CON = Forwarded From A Congressional Office DP = Defect Petition,result Of A Defect Petition EVOQ = Hotline VOQ EWR = EARLY WARNING REPORTING INS = Insurance Company IVOQ = NHTSA Web Site LETR = Consumer Letter MAVQ = NHTSA Mobile APP MIVQ = NHTSA Mobile APP MVOQ = Optical Marked VOQ RC = Recall Complaint, Result Of A Recall Investigation RP = Recall Petition, Result Of A Recall Petition SVOQ = Portable Safety Complaint Form (PDF) VOQ = NHTSA Vehicle Owners Questionnaire
Incident State Code:
Vehicle Operator's Name:
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