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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 262 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC P0633: Immobilizer Key Not Programmed >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0633 will set any time the ECM enters learn mode.

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