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.
Engine/Powertrain Control Module Reset Procedure
The diagnostic trouble codes in ECM memory will be erased by removing the negative battery cable from the battery or using an OBD II scan tool. However, for fuel system rich/lean or misfiring DTC(s), the diagnostic trouble code will be erased if both of the following conditions are met:
- When driving conditions (engine speed, engine coolant temperature, etc.) are identical to those when the malfunction was first recorded.
- When the ECU does not re-detect the malfunction for 80 driving cycles.
After disconnecting battery or replacing ECM, drive vehicle to enable ECM to relearn driveability. Inform your customer that they may experience driveability different from what they are accustomed to until ECM completes relearn function.
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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