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DTC P0633Diagnostic Instructions
DTC DescriptorDTC P0633: Immobilizer Key Not ProgrammedCircuit/System DescriptionWhen learning the security code, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode. DTC P0633 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the security code and challenge/response are learned, learn mode will be exited when the engine is successfully started. If the ECM does not exit learn mode, P0633 will remain current and indicate a fault. Conditions for Running the DTCThe ECM is in learn mode. Conditions for Setting the DTCDTC P0633 will set any time the ECM enters learn mode. Action Taken When the DTC SetsThe security indicator in the instrument cluster will illuminate. Conditions for Clearing the DTC
Diagnostic AidsThe key referenced in the DTC descriptor does not refer to the vehicle key. In this case, key is referring to the challenge response. Reference InformationSchematic ReferenceConnector End View ReferenceDescription and OperationImmobilizer Description and Operation Electrical Information ReferenceScan Tool ReferenceControl Module References for scan tool information Circuit/System VerificationNote: Because of normal system communications between the BCM and ECM, any immobilizer B-codes must be diagnosed prior to the diagnosis of P-codes. Perform the Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming . The ECM should successfully complete the password learn and the vehicle should start.
Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure.
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