B3031

DTC B3031

Diagnostic Instructions

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



DTC Descriptor
DTC B3031
- Security System Controller In Learn Mode




Circuit/System Description

When learning a vehicle key, the body control module (BCM) is placed in learn mode. DTC B3031 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the coded key is learned, learn mode will be exited and the DTC cleared. If the BCM does not exit learn mode, B3031 will remain current and indicate a fault.


Conditions for Running the DTC

The immobilizer system is in learn mode.


Conditions for Setting the DTC

DTC B3031 will set any time the BCM enters learn mode.


Action Taken When the DTC Sets

The security indicator will illuminate.


Conditions for Clearing the DTC

* A current DTC will be cleared upon the successful exit of learn mode.
* A history DTC will be cleared after 100 malfunction-free ignition cycles.



Reference Information
Schematic Reference

Immobilizer Schematics (Immobilizer Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Immobilizer Description and Operation (Immobilizer Description and Operation)
Electrical Information Reference

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

Scan Tool Reference

Control Module References (Programming and Relearning)for Scan Tool Information


Circuit/System Verification

Important: When performing a 10 Minute Relearn Procedure, all keys not learned at that time will be erased and not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure should all vehicle keys not be present at the time of repair.



1. Verify DTC B3055 is not set as current.

• If DTC B3055 is set as current, refer to DTC B3055 (B3055).

2. Perform the 10 Minute Vehicle Key Relearn procedure. Refer to Replacing Keys (North America except Canada) (Replacing Keys (North America except Canada))Replacing Keys (Canada) (Replacing Keys (Canada)). The BCM should exit learn mode and DTC B3031 should clear.

• If the BCM does not exit learn mode, replace the BCM.




Repair Instructions

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


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