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.
Test Procedure
If a No Forward, No REVERSE, or Will Not Move condition occurs:
- Set the parking brake.
- With the ignition OFF, disconnect the 80-way connector at the transmission control module (TCM).
- Using a fused jumper wire, connect terminal R of the automatic transmission inline 20-way connector to a known good ground.
- Start the engine and move the range selector to REVERSE position.
The transmission should engage REVERSE range.
- Move the range selector to the D position.
The transmission should engage THIRD range.
If REVERSE and THIRD range are available in Limp Home Mode, an electrical failure may be indicated. If only 1 of the 2 ranges, or neither, was obtainable, this may indicate an internal hydraulic failure such as one of the following:
- Failed clutch
- Stuck valve
- Solenoid failure
The clutches that could possibly have an indicated failure in Limp Home are the 1-2-3-4 clutch, the 3rd, 5th and reverse clutch, and the low and reverse clutch.
NO RELATED
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.