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.
Diagnostic Test
CHECK FOR TRANSMISSION CONTROL MODULE (TCM) DTCS
This Diagnostic Trouble Code (DTC) will set if a DTC is detected in the TCM.
- Repair the TCM DTCs. Refer to DIAGNOSTIC CODE INDEX, 8HP50/850RE or DIAGNOSTIC CODE INDEX, 8HP75 .
- Perform the DRIVER ASSISTANCE SYSTEM MODULE (DASM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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.
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