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.
2012 Chevrolet Avalanche 2WD V8-5.3LFACTORY OEM SERVICE PROCEDURE
Control Module: Locations
Powertrain Component Views
Transmission and Transfer Case Components (M99 with NQH)
1 - Automatic Transmission Output Shaft Speed (OSS) Sensor
2 - Vehicle Speed Sensor (VSS)
3 - Transfer Case Encoder Motor
4 - Transfer Case 2/4 Wheel Drive Actuator Position Sensor
5 - Transmission Power Inverter Module (3 Phase) Cable Cover
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.