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Diagnostic Aids

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.

DTC P1629 is an indicator that the fuel enable password was not received within the required time. This does not necessarily indicate a fault is present with the BCM or PCM. Factors such as a long engine crank, a delay in the serial data communication, or B-codes set in the BCM will cause DTC P1629 to set. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.

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