The generator battery disconnect control module monitors the internal +5V reference for a out of range condition.

The engine is running, and the 12 V input to the generator battery disconnect control module is greater than 9 volts.

P1A07

The generator battery disconnect control module detects the internal +5V reference circuit is less than 4.7 volts for greater than 3.7 seconds.

The DTC sets, does not affect hybrid operation.

The generator battery disconnect control module detects the internal +5V reference circuit is greater than 4.7 volts.

Schematic Reference

Hybrid Energy Storage Schematics

Connector End View Reference

Hybrid Energy Storage Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List scan tool information.

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.

If the DTC occurs with P0AC0, P0AC1, P1A48 then the failure this diagnostic detects may have been the root cause of other current sensor DTCs that may have set.

1. Verify the DTC is set as current. If other DTCs are set diagnose those first.
2. Disconnect generator battery disconnect control module C1 harness connector. Refer to Hybrid Battery Service Disconnect/Connect
3. Disconnect the current sensor harness.
4. Test for greater than 100k Ohms between terminals 9 and 10.

⇒	If less than specified value replace the harness.

5. Test for less than 1.0 Ohm between terminal 9 and terminal B and between terminal 10 and D.

⇒	If greater than specified value replace the harness.

6. If the circuits test normal, replace the generator battery disconnect control module

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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