GM 19209820
PCM

The powertrain control module (PCM) service requires either replacement of the PCM or EEPROM programming. Check the PCM for correctness prior to installation of the new part. A new service PCM requires installation after confirming the faulty PCM. A scan tool should be used first to extract and log the engine oil life percentage because this data needs to be included during programming the new module. Failure to perform this step results in 100% default oil life triggering an immediate 5000 km (3,000 mi) oil change from the previous service interval. Disconnect the PCM harness connectors from the PCM when the ignition is OFF to stop possible internal damage. The PCM connector surfaces should be checked for dirt particles and the connector gaskets need verification for correct installation to avoid foreign material entry. Detach the mounting tabs from the PCM bracket during PCM removal because contact with either connector pins or soldered components leads to electrostatic discharge (ESD) damage. After placing the PCM into its mounting bracket so tabs completely engage the user must connect the PCM harness connectors to the body section. The installation of a new PCM will require appropriate programming.

The service of a powertrain control module (PCM) includes two main approaches: either PCM replacement or EEPROM electrically erasable programmable read-only memory programming. The PCM requires an inspection to confirm the correct replacement component will be installed. The next step is to remove the failing PCM before you install the newly obtained service PCM. First scan the tool to obtain engine oil life percentage for programming the new replacement module because inadequate data entry will cause default settings to set oil change intervals at 5000 km (3,000 mi). The disconnect process for PCM harness connectors should happen with ignition OFF to avoid harming internal components. Before connector installation examine the PCM connector surfaces while checking that each gasket is properly installed to avoid contaminant entry. You should disconnect the PCM bracket mounting tabs during PCM removal but keep away from connector pins or soldered components to stop possible electrostatic discharge (ESD) harm. To install the unit place the PCM inside its bracket while making sure the tabs properly interlock before connecting the PCM harness connectors to the body of the PCM. Programming of new PCM units is mandatory after new PCM installation.

Install the PCM onto the studs and secure it with the retaining bolts and nuts, tightening both to 8 N.m (71 lb in).

Remove the faulty PCM and install the new service PCM.