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)
- Remove the side panels from center console.
- Drill out the security screws to the right of the bracket with screwdriver (P/N 998 5477).NOTE:
Ensure that no filings fall onto the carpet.
- Pull out the right-hand side of the bracket.
- Remove the engine control module (ECM) from its clamp and disconnect the connector.
Before replacing with a new engine control module (ECM), the Verlog- code in the old control module must be blanked. The code is erased using the Scan Tool (ST), which communicates with the immobilizer system. If the code is not erased, the control module cannot be tested if it is returned under warranty, or if it is to be installed in another car. The reason for this is that the module has learned the Verlog code generated by the immobilizer control module in the car in which the module has been installed. After this, the module only works with that particular immobilizer if the Verlog code is not erased.
The Verlog-code can only be erased using the particular immobilizer- control module whose Verlog-code the engine control module (ECM) has learned.
Erase the Verlog code in the engine control module (ECM)) according to the service information for the Volvo Scan Tool (ST). PIN is obtained from the Volvo central car register. Use the same procedure as for ordering a mechanical key.
Keep the ignition switched off after erasure until the engine control module (ECM)) has been removed from the car. Otherwise the engine control module (ECM) will relearn the Verlog code.
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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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