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.
Replacing Engine Control Module (ECM)
Avoid touching the pins in the control module and the corresponding connector on the cable harness.
There is a risk of static discharge which could damage the control module.
Discharge yourself and tools to be used by holding the tool's metal part and touching a body part on the car just before starting to work.
If voltage is approximately 0 V on terminal #B15 on the Engine Control Module (ECM), when the gear-shift position sensor is in position P or N, the circuit for the gear-shift position sensor is working.
The fault may be in the Engine Control Module (ECM).
Try replacing Engine Control Module (ECM).
Before replacing the control module, ensure that all other relevant symptom tests have been carried out.
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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.