DTC B11DB-87: Battery Monitoring Module "A" - Missing message: Action

NOTE: If DTC B11DB-87 is flagged but a "charge system fault" warning/light is not present on the instrument cluster, then the likelihood is that the battery monitoring system control module is NOT the faulty part. If this DTC is logged, follow the diagnostic steps detailed in the Battery Diagnosis and Testing BEFORE replacing the battery monitoring system control module

Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the connection between the battery monitoring system control module and the battery
Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the LIN bus circuit between the gateway module and the battery monitoring system control module for circuit fault. Clear the DTC and retest
If the problem persists, check and install new battery monitoring system control module as required