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Home >> GMC Truck >> 2003 >> K 1500 Truck 4WD V6-4.3L VIN W >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Engine Control Module >> Service and Repair >> Powertrain Control Module (PCM) Replacement

Powertrain Control Module (PCM) Replacement

POWERTRAIN CONTROL MODULE (PCM) REPLACEMENT

Service of the powertrain control module (PCM) should consist of either replacement of the PCM, or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the PCM to be replaced, the replacement PCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM.

Removal Procedure

IMPORTANT:
- To prevent internal PCM damage, the ignition switch must be OFF when disconnecting or connecting power to the PCM.
- Remove any debris from around the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion onto the PCM.
- The replacement PCM must be reprogrammed.




1. Disconnect the negative battery cable.
2. Release the PCM cover mounting tabs.
3. Release the PCM cover from the mounting brackets.
4. Remove the PCM cover.




5. Loosen the PCM electrical connector bolts (2).

NOTE:
- Refer to PCM and ESD Notice in Service Precautions.
- In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

6. Disconnect the PCM electrical connectors.




7. Release the spring latch from the PCM.
8. Release the PCM mounting tabs from the PCM.
9. Remove the PCM.

Installation Procedure




1. Install the PCM.
Ensure that the mounting tabs are engaged.
2. Secure the spring latch to the PCM.




3. Connect the PCM electrical connectors.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Tighten the PCM electrical connector bolts (2).

Tighten
Tighten the bolts to 8 N.m (71 lb in).




5. Install the PCM cover.
Ensure the mounting tabs are engaged into the mounting holes in the cover.
6. If a NEW PCM was installed, program the PCM. Programming and Relearning
7. Perform the crankshaft position (CKP) system variation learn procedure. Programming and Relearning
8. If necessary, reset the engine oil life monitor. Refer to GM Oil Life System - Resetting in Maintenance and Lubrication.
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