Silverado 3500 2WD V8-6.6L DSL Turbo VIN 2 (2004)
Engine Control Module: Service and Repair
ENGINE CONTROL MODULE (ECM) REPLACEMENT
Service of the engine control module (ECM) should consist of either replacement of the ECM or programming of the electrically erasable programmable
read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the replacement ECM should be checked to ensure that the
correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM.
REMOVAL PROCEDURE
IMPORTANT:
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To prevent internal ECM damage, the ignition switch must be OFF when disconnecting or connecting power to the ECM.
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Remove any debris from the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or
replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM.
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The replacement ECM must programmed.
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It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil
life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed
at 5000km (3,000 mi) from the last engine oil change.
1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
2. Disconnect the negative battery cable.
3. Disconnect the ECM electrical connectors (2).
4. Release the ECM cover retaining tabs.
5. Remove the ECM cover from the bracket.
6. Remove the ECM cover.
INSTALLATION PROCEDURE
