00-05 Chevrolet WB with History DTC B3128 - kw BCM door lock

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Impala or Monte Carlo with a DTC B3128 stored in BCM in history, no lamp set.

This DTC will latch in history for reasons unknown but not cause any symptoms with the vehicle. Do not try to repair a condition which may be setting the DTC unless the code is current. In other words, a history DTC B3128 should be disregarded.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

(2000-2005 Chevrolet Impala) and (2000-2005 Chevrolet Monte Carlo)

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