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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 347 (Battery, Starting System And Charging System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P155E, P155F, or P156E >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

The T19 Multifunction Power Supply Converter is used to boost battery voltage to sensitive loads during engine restart. It provides two voltage outputs that provide the boosted voltage. The T19 Multifunction Power Supply Converter communicates to the K20 Engine Control Module, and the K20 Engine Control Module sets faults for any mismatch between alive rolling counts and protection values.

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