P0AC6
DTC P0A9C, P0AC6, P0ACB, P0AE9, P1A19 or P1A1C
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0A9C
- Hybrid Battery 1 Temperature Sensor Performance
DTC P0AC6
- Hybrid Battery 2 Temperature Sensor Performance
DTC P0ACB
- Hybrid Battery 3 Temperature Sensor Performance
DTC P0AE9
- Hybrid Battery 4 Temperature Sensor Performance
DTC P1A19
- Hybrid Battery 5 Temperature Sensor Performance
DTC P1A1C
- Hybrid Battery 6 Temperature Sensor Performance
Circuit/System Description
The battery energy control module (BECM) monitors the hybrid battery pack temperature sensors to detect the failure of any sensor during a rationality check.
Conditions for Running the DTC
Ignition ON
Conditions for Setting the DTC
Module temperature 1, 2, 3, 4, 5, or 6 - module temperature average is greater than battery rationality threshold. Where battery rationality threshold equals as follows:
Action Taken When the DTC Sets
Does not affect hybrid system operation.
Conditions for Clearing the DTC
Battery module temperatures are less than 8°C (46.4°F) different from the average of all temperatures.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics ()
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Special Tools
J 35616 GM Approved Terminal Test Kit
Circuit/System Testing
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.
Important: Use the following list to identify the appropriate terminals to test:
* J-35616-65B for female terminals
* J-35616-64B for male terminals
P0A9C
Battery 1 temperature sensor terminals 3 and 4
P0AC6
Battery 2 temperature sensor terminals 5 and 6
P0ACB
Battery 3 temperature sensor terminals 7 and 8
P0AE9
Battery 4 temperature sensor terminals 13 and 14
P1A19
Battery 5 temperature sensor terminals 15 and 16
P1A1C
Battery 6 temperature sensor terminals 17 and 18
Important: In order to avoid damaging BECM X1 and X2 connector terminals, the proper test probes should be used. The proper test probes are as follows:
* J-35616-65B for female terminals
* J-35616-64B for male terminals
Important: The following test must be performed when the battery pack has equalized at room temperature. An increase or decrease in temperature will cause resistance to change and may result in invalid test results.
1. Ignition OFF, disconnect harness connector X1 from the BECM. Refer to Hybrid Battery Service Disconnect/Connect ().
2. Test for 10.5-11.5k ohms between the applicable temperature sensor circuit terminals.
• If not within the specified range, test or replace the applicable temperature sensor.
3. If all circuits test normal, replace the BECM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Generator Battery Temperature Sensor Replacement ()
* Control Module References (Programming and Relearning) for BECM replacement, setup, and programming