Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2022 GMC Hummer EVFACTORY OEM SERVICE PROCEDURE
Hybrid/EV Energy Storage - Repair Instructions
- Repair Instructions
- High Voltage System Inspection
- Hybrid/EV High Voltage Battery Reduced Range Analysis
- Battery Energy Control Module 1 Replacement
- Battery Energy Control Module 2 Replacement
- High Voltage Battery Positive Cable Replacement
- Hybrid/Electric Vehicle Battery Pack Replacement and Shipping Preparation
- Hybrid/Electric Vehicle Battery Pack Removal and Installation
- Hybrid/Electric Vehicle Battery Pack Lifting System
- Battery Positive and Negative Cable Extension Cable Replacement
- Battery Positive and Negative Cable Replacement (Front Drive Unit)
- High Voltage Battery Ground Cable Replacement (Front of RESS to Front Frame)
- High Voltage Battery Ground Cable Replacement (Rear of RESS to Rear Frame)
- Clear Secured High Voltage DTCs
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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