P1631

DTC P1631

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC P1631
- Theft Deterrent Fuel Enable Signal Not Correct

Circuit/System Description

The body control module (BCM) sends the fuel enable password to the engine control module (ECM) via the serial data circuit. The ECM compares this password to the learned password. If the learned password matches the password received from the BCM, the ECM will allow vehicle starting.

Conditions for Running the DTC

Ignition is in the ACCESSORY or RUN position.

Conditions for Setting the DTC

The ECM receives an incorrect fuel enable password from the BCM.

Action Taken When the DTC Sets

* The security indicator will illuminate.
* Vehicle starting will be disabled.

Conditions for Clearing the DTC

* A current DTC will be cleared when a correct fuel enable password is received.
* A history DTC will be cleared after 40 malfunction-free ignition cycles.

Reference Information
Schematic Reference

Immobilizer Schematics (Immobilizer Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Immobilizer Description and Operation (US, Caribbean, C America, and Mexico) (Immobilizer Description and Operation (US, Caribbean, C America, and Mexico))
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Important: Because of normal system communications between the TDM and ECM, any theft deterrent B-codes must be diagnosed prior to the diagnosis of P-codes.


Perform the 10-Minute Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming (US, Caribbean, C America, and Mexico) (Programming and Relearning)�Immobilizer System Component Programming (without RPO BAE) (Programming and Relearning). The ECM should successfully complete the password learn and the vehicle should start.

If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for ECM replacement, setup and programming