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.
Rear Drive Unit (RDU) Identification
The AWD system is equipped with a bar coded active torque coupling solenoid. The 4-digit bar code is located on the bottom of the Rear Drive Unit (RDU). The PCM uses this 4-digit bar code information to match the clutch characteristics of the active torque coupling solenoid with the desired output torque. If the bar code information does not match the PCM information, driveline damage or driveability concerns can occur.
When a PCM is replaced, the new PCM needs to be configured with the existing active torque coupling solenoid bar code information.
If the rear drive axle is replaced, the existing PCM needs to be configured with the new active torque coupling solenoid bar code information.
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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