GM Service Manual Online
For 1990-2009 cars only

Important: DO NOT replace the body control module (BCM) unless a diagnostic trouble code (DTC) remains current after all of the DTC tables are executed. Do not replace the BCM based on the history codes.

The BCM is connected to the Class 2 serial data link. The BCM is capable of setting DTCs. A history DTC is a malfunction that disappears in the next ignition cycle. The history DTCs may be especially useful in diagnosing an intermittent problem. An explanation of the history DTCs are given below in the DTC table.

Diagnostic Trouble Code

Explanation

Passlockā„¢ Theft Deterrent

B2947

DTC B2947 Security System Sensor Power CKT Low

B2948

DTC B2948 Security System Sensor Power CKT High

B2957

DTC B2957 Security System Sensor Data Circuit Low

B2958

DTC B2958 Security System Sensor Data Circuit High

B2960

DTC B2960 Invalid Coded Key Present

B3031

DTC B3031 Key Decoder Device in Assem Learn Mode

B3033

DTC B3033 Security System Indicates Tamper