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.
Circuit/System Description
When replacing a theft deterrent module (TDM), the engine control module (ECM) must learn the new start enable password from the replacement TDM. If the ECM is replaced with a service replacement part, it is in a functional state to automatically learn the vehicle start enable password. If the TDM is replaced, the ECM must be placed in learn mode so it can learn the new TDM password. This DTC indicates the ECM is in a functional state to learn the TDM start enable password.
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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.