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DTC P1629Diagnostic Instructions
DTC DescriptorDTC P1629: Immobilizer Fuel Enable Signal Not ReceivedCircuit/System DescriptionThe body control module (BCM) sends the prerelease password to the engine control module (ECM) via the serial data circuit. The ECM then sends a challenge to the BCM. Both the ECM and BCM perform a calculation on this challenge. If the calculated response from the BCM equals the calculation performed by the ECM, the ECM will allow vehicle starting. Conditions for Running the DTCIgnition is in the ACCESSORY or RUN position. Conditions for Setting the DTCThe ECM receives an incorrect prerelease password from the BCM. Action Taken When the DTC Sets
Conditions for Clearing the DTC
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. Control Module References for ECM replacement, setup and programming |
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