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HOMESERVICE MANUALSCHEVROLET2001SUBURBAN C1500REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 21 (ENGINE CONTROLS - 4.3L - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSPOWERTRAIN CONTROL MODULE REPLACEMENTNOTES
2001 Chevrolet Suburban C1500

Powertrain Control Module Replacement: Notes

2001 Chevrolet Suburban C1500SECTION Notes
WARNING: This page is about a different car, the 2001 GMC Sierra and 2001 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Service of the powertrain control module (PCM) should consist of either replacement of the PCM or electrically erasable programmable read only memory (EEPROM) programming. If diagnostic procedures call for PCM replacement, inspect the replacement PCM to ensure that the correct part PCM is being used.

IMPORTANT:
  • To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example, when working with a battery cable, PCM pigtail, PCM fuse, or jumper cables.
  • Remove any debris from 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 into the PCM.
  • The replacement PCM will not be programmed. DTC P0601 and P0602 indicate the EEPROM is not programmed or has malfunctioned. The following MUST be performed anytime the PCM is replaced:
  • Programming of the EEPROM
  • The PCM Password Learn procedure.
  • The Idle Learn Procedure .
  • The Crankshaft Position System Variation Learn Procedure .
  • Resetting the engine oil life monitor .
  • The Functional Check
  • The following must be performed anytime the PCM is disconnected, loses power, or is reprogrammed:
  • The Idle Learn Procedure .
  • The Functional Check
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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.