What is the case of Buick Excelle failing to start with code P1631?

1 Answers
DeEverly
07/30/25 7:08am
Fault code P1631 is defined in Chinese as an incorrect anti-theft program in the Engine Control Module (ECM). 1. Causes: The role of the anti-theft control module is to ensure that the car starts only when the dedicated key is present and matches various components. 2. Engine Control Module: Also known as the Engine Control Unit (on some vehicles, the engine control module and transmission control module are integrated into a Powertrain Control Module), it controls the operation of the entire engine. Its primary function is to control the optimal fuel injection amount and ignition timing. Another important role is to monitor components related to emission control.
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