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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P1631 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) sends the fuel enable password to the engine control module/powertrain control module (ECM/PCM) via the serial data circuit. The ECM/PCM compares this password to the learn password. If the learned password matches the password received from the BCM, the ECM/PCM will allow vehicle starting.

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