The 2022 GMC Hummer EV Pickup is a first-year tri-motor EV truck on GM's Ultium platform with minimal long-term data. Most documented issues stem from early-production software glitches, charging system faults, and the sheer complexity of its adaptive air suspension and four-wheel steering systems.
Charging System Faults and Inverter Communication Errors
Occasional · high severitySymptoms: Vehicle won't accept charge from any EVSE, Dash warnings for 'Charging System Fault' or 'Service Propulsion System', Inverter throws codes P0A94 or similar high-voltage isolation faults, Intermittent loss of drive power requiring full 12V battery disconnect reset
Fix: Most cases require inverter software reflash (1.5 hrs) or inverter module replacement if hardware fault confirmed. Occasionally traced to faulty onboard charger module. Full inverter R&R is 6-8 hours due to high-voltage lockout procedures and coolant system drain/refill.
Estimated cost: $800-$12,000
Adaptive Air Suspension Compressor and Height Sensor Failures
Common · medium severityTypical onset: 15,000-40,000 mi
Symptoms: Suspension stuck in one ride height, won't adjust for Extract Mode or Aero Mode, Compressor runs continuously or makes grinding noise, Dash message 'Service Suspension System', Vehicle sits nose-high or nose-low after sitting overnight
Fix: Height sensors are exposed under the frame and get contaminated by road debris—clean or replace sensors first (1 hr each corner). Compressor failures require full unit replacement with reservoir (4 hrs), includes bleeding air system and recalibration with Tech2 or GDS2 scan tool.
Estimated cost: $600-$4,200
Four-Wheel Steering Actuator and Sensor Malfunctions
Occasional · high severitySymptoms: Rear wheels won't steer, CrabWalk mode disabled, Harsh clunking from rear axle during low-speed turns, Dash warning 'Service Four Wheel Steer' with reduced turning radius, Steering feels unstable or wanders at highway speed
Fix: Rear-steer actuator motor or position sensor replacement requires rear subframe partial drop (5-7 hrs). Must perform four-wheel alignment and steering angle sensor calibration after repair. Early software updates addressed some phantom faults, so always check TSBs first (0.5 hr diag).
Estimated cost: $1,200-$5,800
12V Battery Drain and Auxiliary Power Module Failures
Common · medium severitySymptoms: Vehicle won't wake from sleep, completely dead despite full HV battery charge, 12V battery drains in 3-5 days when parked, Electrical accessories (cameras, screens, HVAC) randomly reboot or go black, Jump-starting required even though main traction battery shows 80%+ charge
Fix: The DC-DC converter that charges the 12V system from the HV pack can fail or go into protection mode. Parasitic draw testing (1 hr) often reveals modules staying awake. 12V AGM battery replacement is 0.5 hr but converter replacement is 3-4 hrs under rear seat area with HV disconnect required.
Estimated cost: $250-$3,500
Infotainment Screen Freezes and Software Glitches
Common · low severitySymptoms: Main 13.4-inch screen freezes or goes black, backup camera non-functional, UltraVision camera system shows 'Service Camera System' with no camera feed, Wireless CarPlay/Android Auto drops connection constantly, Climate controls unresponsive, stuck on last setting
Fix: GM has released multiple OTA updates addressing these issues—always check for pending updates first (customer can do at home). Hard reboot by holding power+volume down for 30 seconds resolves 70% of cases. Infotainment module replacement is 2 hrs if hardware fault confirmed, but rarely needed.
Estimated cost: $0-$2,800
Drive Unit Coolant Leaks and Thermal Management Issues
Rare · high severityTypical onset: 20,000-50,000 mi
Symptoms: Pink coolant puddle under front or rear of vehicle, Reduced propulsion power warning with 'Powertrain Hot' message, Loss of coolant in HV battery thermal system reservoir, Motor temperature climbs rapidly during towing or WOT acceleration
Fix: Coolant leaks typically from drive unit seal or heat exchanger connections. Each drive motor R&R is 8-10 hrs (front) or 10-12 hrs (rear) due to HV lockout, subframe drop, and half-shaft removal. Battery pack coolant leaks may require pack drop (16+ hrs at dealer with certification).
Estimated cost: $3,500-$18,000
First-year tech on a $110k truck means you're a beta tester—buy CPO with warranty or wait for 2024+ model years after GM works out the bugs.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.