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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 171 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B1977 >> Action Taken When the DTC Sets

Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle starting will be suspended and the security indicator will be illuminated.

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