The engine control module (ECM) monitors to detect when it can no longer control the state of the contactor.

When the Ignition is in RUN, the engine running.

If the service disconnect is active, the diagnostic will fail.

The hybrid system is disabled.

The contactor status is CLOSED while the contactor is commanded to CLOSE.

Schematic Reference

Hybrid Energy Storage Schematics

Connector End View Reference

Hybrid Controls Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

This diagnostic also fails when the generator battery disconnect control module refuses to obey the ECM’s CLOSE command. The contactor can be reported as Closed, Impact Detected, Service Disconnect, Open, Overtemperature, and Fault, and the generator battery disconnect control module sets this status.

If the DTC is current, check the status of the contactor with the scan tool. If the status is Service Disconnect, verify that the service disconnect is fully engaged by the generator battery disconnect control module cover when closed. If this diagnostic is accompanied by hybrid battery temperature circuit DTCs, diagnose those DTCs first. If the vehicle was in an event where the airbag deployed, the crash event must be deasserted in vehicle communications before the contactor will be allowed to close. If the contactor status is Fault, then there may be an issue with the battery disconnect unit.

If the DTC is in history with no other faults, or the generator battery disconnect control module cover was fully seated, Inspect connections at the generator battery disconnect control module harness connector C2.

Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.

Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

1. If other DTCs are set diagnose those first.
2. Cycle the ignition switch from OFF to RUN several times.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for generator battery disconnect control module replacement, setup, and programming.