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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1678 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P1631 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The ECM receives an incorrect prerelease password from the TDM.

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