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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0621 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

During the key ON test, the PCM detects a high signal voltage on the generator turn on signal circuit for at least 5 seconds.

OR

During the RUN test, the PCM detects a low signal voltage on the generator turn on signal circuit for at least 15 seconds.

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