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Home › Chevrolet › 2018 › Suburban 3500 HD LS › Repair and Diagnosis › Body & Frame › Ignition Switch/Steering Lock › Immobilizer System › Diagnostic Information And Procedures › DTC P1649: Immobilizer Security Code Not Programmed › Conditions for Setting the DTC

Conditions for Setting the DTC

The ECM has not learned a security code.

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