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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (12 V Starting And Charging - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B19F4 >> Circuit/System Description

Circuit/System Description

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The control module (s) monitor the system voltage on the B+ circuit and ignition circuit to ensure that it stays within the proper range. An open or high resistance on ground circuit may affect the modules ability to monitor and report the correct system voltage.

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