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.
Making Changes To The TCM Calibration
If the TCM does not complete the reflash after two consecutive attempts, follow the instructions listed below:
- If the TCM reprogramming aborts during the procedure:
- Reprogram the TCM again.
- After the TCM reprogramming is successfully completed, clear the continuous DTCs in the PCM and the TCM.
- If the TCM reprogramming aborts immediately after the start:
- Turn the ignition OFF.
- Disconnect the PCM B connector, and leave it disconnected.
- Turn the ignition ON.
- Start the TCM reprogramming.
- After the TCM reprogramming is successfully completed, turn the ignition OFF and connect the PCM B connector.
- Clear any PCM and TCM DTCs that may have been stored during reprogramming.
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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