GM 19210073
Control Module

Disconnect or reconnect the pcm connector only when the ignition is off because doing so without power allows internal damage to occur. The process starts by disconnecting the negative Battery Cable before taking off the left closeout/insulator panel. The pins on the pcm connector along with soldered components must be protected from electrostatic discharge through avoidance of touching them to prevent failure. Also avoid removing integrated circuit boards from their carrier. The pcm harness connectors need disconnection by using a thumb to push down the locking tab and pull up the release lever. Use a finger to make the pcm retaining tab depression while sliding the pcm unit upward and out of the pcm bracket. The new pcm requires inspection to verify its service number matches the one from the defective unit. Bolt the new pcm into position through the bracket while allowing the retaining tab to produce a locking connection before installing the pcm connectors and securing all release levers. Put back the left closeout/insulator panel and then close the negative Battery Cable terminal. The replacement pcm needs reprogramming while the maintenance of crankshaft position (CKP) system variation learn process should happen immediately. The service programming system (SPS) should be used to program the existing pcm.

The replacement process demands an off ignition switch before disconnecting or reconnecting the pcm connector because it safeguards against internal damage to the powertrain control module. Start the procedure by detaching the negative Battery Cable. You should first lower the locking tab while raising the release lever to disconnect the pcm harness connectors . The pins of the pcm connector along with the soldered components need handling protection from electrostatic discharge damage by not touching them directly. Anticipate all safety protocols when handling integrated circuit boards and refrain from removing them from their carrier. Afterward push down the pcm retaining tab to extract the pcm from its pcm bracket position. Start installation by checking the service number on the newly obtained pcm component for accuracy with the defective unit. Insert the pcm into pcm bracket by pushing it until the retaining tab achieves proper lock then route the pcm harness connectors and fasten the release levers. Touching the pcm connector pins or soldered components must always be avoided during installation or replacement. After reattaching the negative Battery Cable users should proceed with pcm programming. The replacement pcm needs to be programmed and the crankshaft position system needs variation learning procedures before installation.

Reconnect the negative battery cable and program the PCM, ensuring that the replacement PCM is reprogrammed and the crankshaft position system variation learn procedure is performed.

Place the PCM onto the rear bracket and position the front bracket.

Ensure the ignition is OFF to prevent internal damage when disconnecting or reconnecting the PCM connector.