Volt

DTC B3902

When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. The environment identifier is used to prevent the swapping of modules between vehicles. The body control module (BCM) is the keeper of the environment identifier. The instrument cluster, electronic brake control module (EBCM), HVAC control module, sensing and diagnostic module (SDM), engine control module (ECM), and steering column lock control module, if equipped, each learn the environment identifier during their configuration process. During vehicle operation, each of these modules compare their environment identifier to that of the BCM. If the identifiers match, vehicle starting is allowed. If an environment identifier does not match, vehicle starting is disabled.

Ignition is in the ACCESSORY or RUN position.

The control module's environment identifier does not match the environment identifier stored by the BCM.

A current DTC will be cleared when the module learns a correct environment identifier.

Schematic Reference

Immobiliser Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobiliser Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Perform the Programming and Setup procedure for the control module that set DTC B3902.
2. Verify DTC B3902 does not set after programming.

⇒	If the DTC sets after programming

Replace the control module that set the DTC.

⇓	If the DTC does not set after programming

3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for instrument cluster, EBCM, HVAC control module, SDM, ECM, or steering column lock control module replacement, programming, and setup