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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 P0615, P0616, or P0617 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch is placed in the START position, a discrete signal is supplied to the K9 Body Control Module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the K20 Engine Control Module (ECM) that crank has been requested. The ECM then verifies that the transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit 625 of the starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid. If the voltage is out of range or thee is an open/high resistance condition on Control Circuit 625 or Ground Circuit 6450 the fault will set the appropriate DTC during engine cranking.

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