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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 686 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P1630 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The theft deterrent module (TDM) sends the fuel enable password to the powertrain control module (PCM) via the serial data circuit. The PCM verifies the fuel enable password received matches the password stored in memory. If the fuel enable password is correct, the PCM enables the starting and fuel delivery systems. When replacing a PCM with a GM SPO replacement part, the new PCM will learn the incoming fuel continue password immediately upon receipt. DTC P1630 is an informational code indicating the PCM is ready to learn the fuel continue password.

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