P0A0D
DTC P0651, P0A0C, or P0A0D
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0651
-
5V Reference 2 Circuit
DTC P0A0C
-
High Voltage System Interlock Circuit 1 Low Voltage
DTC P0A0D
-
High Voltage System Interlock Circuit 1 High Voltage
Diagnostic Fault Information
Circuit/System Description
The high voltage interlock circuit is utilized to verify high voltage component integrity. High voltage interlock circuit is a circuit loop that passes through certain high voltage components. High voltage interlock circuit is used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes high voltage interlock circuit to open. The starter/generator control module monitors both the high voltage interlock 5 V reference circuit voltage and the high voltage interlock signal circuit voltage in order to detect circuit faults. When the starter/generator control module detects a loss of high voltage interlock circuit voltage, the high voltage contactors are commanded open.
Conditions for Running the DTC
Battery voltage is greater than 6 V
Conditions for Setting the DTC
DTC P0651
Voltage on the 5 V reference circuit 2 is less than 4.39 V or greater than 4.61 V
DTC P0A0C
Voltage on the high voltage interlock signal circuit is less than 0.5 V
DTC P0A0D
Voltage on the high voltage interlock signal circuit is grater than 4.5 V
Action Taken When the DTC Sets
DTCs P0651, P0A0C, and P0A0D are type B DTCs
Conditions for Clearing the DTC
DTCs P0651, P0A0C, and P0A0D are type B DTCs
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Drive Motor Battery System Description Drive Motor Battery System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Testing
Danger:
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedures exactly as written may result in serious injury or death.
Danger:
The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information♦(SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
Note:
In High Voltage Disabling High Voltage Disabling , perform the disabling procedure for servicing components within the A4 hybrid/EV battery pack. The C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 will be disconnected as part of the disabling procedure.
1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
2. Connect the 12 V battery, ignition ON.
Note:
Testing is performed at the interlock connector that the F102 hybrid/EV battery pack cable cover secures to. The F102 hybrid/EV battery pack cable cover was removed as part of the high voltage disabling procedure.
3. Test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the 5 V reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K59 starter/generator control module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K59 starter/generator control module.
• If between 4.8-5.2 V
4. Verify DTC P0A0D is not set.
• If the DTC is set
1. Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module.
2. Test for less than 1 V between the signal circuit terminal B and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K59 starter/generator control module.
• If the DTC is not set
5. Ignition OFF, connect a 3 A fused jumper wire between the 5 V reference circuit terminal A and the signal circuit terminal B, ignition ON.
6. Verify DTC P0A0C is not set.
• If the DTC is set
1. Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K59 starter/generator control module.
• If the DTC is not set
7. Test or replace the F102 hybrid/EV battery pack cable cover.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Generator Control Module Cable Cover Replacement Generator Control Module Cable Cover Replacement
* Battery Energy Control Module Wiring Harness Replacement (BDU,BECM and BPIM) Battery Energy Control Module Wiring Harness Replacement (BDU,BECM and BPIM)Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2) Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)
* Control Module References Programming and Relearning for starter/generator control module replacement, programming, and setup