My 2023 GMC Hummer EV 3X has experienced repeated thermal-protection failures in the high-voltage battery and drive-motor cooling system, causing the vehicle to enter limp mode and drop to as low as 12 mph without warning. Stored fault codes: P0C12, P0C13, P2EE0, P2EE1 (battery and drive-unit overheating). A sudden, unannounced drop to 12 mph in a 9,000-lb EV is a serious safety hazard — on highways it creates rear-end collision risk, in intersections it leaves the vehicle stranded in traffic, and on remote roads it can strand the driver with no safe shoulder. Visit 1 (Covert Buick GMC of Bee Cave, TX): 02/09/2026–03/24/2026, 43 days out of service. Repairs: replaced both EV coolant pumps (PN 85605761), replaced Drive Motor Inverter Module 2 (PN 24059125), coolant flush, software update. RO #BUCS138101. GM TAC Case #88689105. Six days after return, on 03/30/2026, the same defect recurred with the same fault codes. Vehicle has now been back at the dealer 38+ additional days with no resolution. GM had pre-sale knowledge of this exact defect on this exact VIN. The vehicle was a GM corporate evaluation unit (factory option code OAR — EVALUATION VEHICLE) operated out of GM Tech Center in Warren, MI. GM took it out of service on 08/07/2025 at 30,169 miles. I took delivery 16 miles later at 30,185 miles. A GM Driver Inspection Form left inside the vehicle at delivery is handwritten with "Limited Speed 12 mph" — the exact limp-mode behavior. GM auctioned the vehicle through CVO Warren Distribution Center without disclosing this condition. I request ODI open a preliminary evaluation of cooling-system thermal-protection failures on 2022–2024 Hummer EV Pickups and SUVs, particularly units with prior corporate/fleet use.
The worst 2023 GMC Hummer EV Pickup problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Engine1
- Fuel system1
- Transmission1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Engine1
- Fuel system1
- Transmission1
Recalls 2
Seat belts: front: anchorage
- What is wrong
- General Motors, LLC (GM) is recalling certain 2023-2024 GMC Hummer EV pick up, 2024 GMC Hummer EV SUV, and 2024 Chevrolet Silverado EV vehicles. The left or right front seat belt buckle attachment bolts may not be tightened properly.
- Risk
- An improperly tightened seat belt buckle may not restrain an occupant as intended, increasing the risk of injury during a crash.
- Remedy
- Dealers will tighten the left and right front seat belt buckle attachment bolts, free of charge. Owner notification letters were mailed December 21, 2023. Owners may contact GMC customer service at 1-833-EVCHEVY (1‑833‑382‑4389) (TTY 711 / 1‑800‑833‑2438) /1-833-HUMMER-EV (1‑833‑486‑6373) (TTY 711 / 1‑800‑833‑2438). GM's number for this recall is N232419280.
Recall number 23V786000 · Recall details
Electrical system: propulsion system: traction battery
- What is wrong
- General Motors, LLC (GM) is recalling certain 2022 BrightDrop EV600 and 2022-2023 GMC Hummer EV Pickup electric vehicles. The high voltage battery pack enclosure may not be properly sealed, allowing water to enter the pack.
- Risk
- Water accumulation in the high voltage battery pack can cause a loss of drive power, increasing the risk of a crash.
- Remedy
- The remedy is currently under development. Owner notification letters were mailed April 13, 2023. Second letters will be sent once the remedy is available. Owners may contact EV Concierge at 1-833-HUMMER-EV, and BrightDrop Service Operations and Support at 1‑888‑987‑4377. GM's number for this recall is N222380031.
Recall number 22V771000 · Recall details
Technical service bulletins for the 2023 GMC Hummer EV Pickup 647
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
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What 2023 GMC Hummer EV Pickup owners say
Most recent owner complaints, unedited.
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Questions about the 2023 GMC Hummer EV Pickup
Is the 2023 GMC Hummer EV Pickup reliable?
Owners have filed 1 complaint about the 2023 GMC Hummer EV Pickup, fewer than a typical Hummer EV Pickup model year.
What is the most common problem with the 2023 GMC Hummer EV Pickup?
Engine and cooling, with 1 complaint. Next is fuel system (1).
How many recalls does the 2023 GMC Hummer EV Pickup have?
2 recalls, covering seat belts and electrical system.
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