2024 GMC Hummer EV Problems: 8 Known Issues

On the 2022-2024 GMC Hummer EV, owners report a cascade of warning messages appearing simultaneously — 'One Pedal Driving Unavailable,' 'Service ESC,' 'Service Trailer Brake System,' and 'Service Active Steering System' — with the vehicle's speed limited to approximately 36 mph. The issue appears related to communication faults between the vehicle's multiple electronic control modules, particularly affecting the electric stability control and four-wheel steering systems. The Hummer EV's CrabWalk and Extract Mode features may also become disabled. The issue can occur without warning and may require a dealer visit to clear.

On the 2022-2025 GMC Hummer EV, one of the most frequently reported real-world failures on the Hummer EV Pickup is parasitic drain on the 12V auxiliary battery, which leaves an otherwise fully charged truck totally unresponsive - no doors, no screens, no ability to shift or start. Two mechanisms drive it. First, the truck does not always fully power down when the driver walks away: owners report having to press the start/stop button on exit or the vehicle stays awake, and a key fob left near the truck repeatedly wakes it. Second, several body and propulsion modules shipped with calibrations that drew excessive current from the 12V system, and the vehicle only polls 12V state roughly once a day, so it does not catch the decline in time to top the battery up from the high-voltage pack. Owners have documented trucks going dead after sitting six days in a garage at 90% state of charge and unplugged. Secondary symptoms once voltage sags include a "conditions unable to shift" error and assorted software malfunctions that clear after a 12V jump.

On the 2022-2024 GMC Hummer EV, some GMC Hummer EV models experience a software anomaly that prevents the vehicle from initiating the charge sequence when plugged into public DC fast chargers. The issue may be caused by oversized or damaged terminals in the charge cord connector at frequently-used stations, but a software bug also prevents the vehicle from gracefully handling connection errors. Additionally, the battery energy control module may fail to exit its commissioning (start-up) state due to the cell monitoring unit going offline, requiring a dealer software reprogram of both the battery energy control module and drive motor control module.

On the 2022-2024 GMC Hummer EV, gM bulletin 10217073 covers specified 2022 GMC Hummer EV Pickups and directs technicians to inspect the X500 electrical connector for corrosion.

On the 2023-2024 GMC Hummer EV, gM recalled 2023-2024 GMC Hummer EV Pickups (along with the 2024 Hummer EV SUV and 2024 Silverado EV built in the same Factory ZERO plant) because the left or right front seat belt buckle attachment bolts may not have been tightened to the specified torque during assembly. An under-torqued buckle anchor can loosen or pull under crash loading, so the belt may not restrain the occupant as designed. Roughly 115 Hummer EV Pickups fall inside the affected build window. This is an assembly-torque escape rather than a design defect, and there is no reliable driveability symptom - an owner generally cannot detect it without inspecting the buckle anchor, which makes VIN verification the only practical check.

On the 2022-2025 GMC Hummer EV, hummer EV Pickup owners report that Super Cruise, a headline feature of the truck, works inconsistently - repeatedly refusing to engage on the same stretches of interstate and tollway where it worked before, and dropping out mid-drive. The dash messaging varies between "Super Cruise Not Available" and "No Road Information." Two distinct causes appear in owner reports and dealer diagnosis. The first is connectivity: the system depends on the OnStar/AT&T data connection to pull map and GPS correction data, and in weak-coverage areas it will not arm; owners describe being bounced between GM, OnStar and the dealer with each blaming the others, and some trucks needed the Super Cruise activation/subscription state fixed on the back end before the feature would work at all. The second is the module itself - dealers have applied a Super Cruise module software update under bulletin 24-NA-143, and in some cases replaced the Super Cruise module outright and reflashed it to the newest patch, which resolved the dropouts.

On the 2022-2025 GMC Hummer EV, gM bulletin PIT6144G documents 2022-2025 GMC Hummer EV owners reporting that the air leveling suspension stops working, with a "Service Leveling System" message in the driver display and DTC C1197 SYM92 stored in the automatic level control module. On a truck that weighs over 9,000 pounds and relies on the air springs for both ride height selection (including Extract Mode and off-road heights) and automatic load leveling, a dead compressor leaves the vehicle stuck at a fixed height and unable to compensate for payload. GM identifies two causes: a plugged or pinched air inlet hose feeding the air suspension compressor assembly, and a software condition in the automatic level control module. Separately, owners have documented rear dampers losing fluid after moderate off-road use - one 2024 pickup took two months at the dealer to diagnose a right-rear damper leak, which was then covered under warranty. Fitting oversize (38-inch) tires has been reported to destabilize the system further and is not a supported configuration.

On the 2022-2024 GMC Hummer EV, the $3,695 hard power-retractable tonneau cover offered on the Hummer EV Pickup - a pickup-only option that does not exist on the SUV - has a documented failure of its drive motor and its electronic control unit. Affected covers stop responding to the in-bed buttons, the interior switch and the app entirely, regardless of whether the truck is on, off, locked or unlocked; some owners report the cover going to sleep and needing repeated resets before failing outright, and others report the cover jamming in the closed position and locking cargo in the bed. A fast-flashing indicator on the tonneau switch is the common tell that the ECU has faulted rather than the motor simply stalling. Heat appears to aggravate the failure - several reports describe the cover refusing to operate in high ambient temperatures. GM covered the condition with a service update spanning 2022 through 2024 pickups.