Hybrid/EV Energy Storage
DTC P0D5E
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 P0D5E
- Charger Bus Discharge Too Long
Circuit/System Description
The battery energy control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery energy control module to the hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code (DTC) information.
The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors are a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor, and multi-function high voltage contactor. The 2 transistors are the precharge transistor and heater transistor. These contactors/transistors close and open in sequence and are controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.
Conditions for Running the DTC
P0D5E
* The charger contactors are commanded open.
* Runs once per charger contacts discharge event.
* None of the following DTCs are set: P0D4E or P0D4F.
OR
* No confirmed charger bus discharge test pass or fail received by the hybrid/EV powertrain control module 2 from the battery charger control module.
* This test runs every 10 seconds after charger discharge event if no confirmed charger bus discharge result is received by the hybrid/EV powertrain control module 2 from the battery charger control module.
Conditions for Setting the DTC
P0D5E
* High voltage bus does not discharge to below 60 V within 1.5 seconds of the charger contactors being commanded open.
OR
* With the charger contactors commanded open, current flowing to battery is greater than 2.5 A with the heater transistor enabled.
Action Taken When the DTC Sets
* DTC P0D5E is a type A DTC.
* All of the contactors will be prevented from closing.
Conditions for Clearing the DTC
* DTC P0D5E is a type A DTC.
* The Clear Secured High Voltage DTCs Reading and Clearing Diagnostic Trouble Codes reset function must be performed with a scan tool before clear codes.
Diagnostic Aids
Note: If the high voltage contactors opened while under high current load, replace the drive motor battery wire junction block relay. The following conditions could cause the high voltage contactors to open while under high current load:
* A collision resulting in supplemental inflatable restraint (SIR) deployment.
* A loss of power or ground to the hybrid/EV powertrain control module 2 while the vehicle is moving.
The precharge time can be affected by the following:
* A long precharge time may be caused by a stuck open hybrid/EV battery negative or hybrid/EV battery multifunction contactor.
* A long precharge time may be caused by a stuck ON hybrid/EV battery precharge transistor.
* A long precharge time may be caused by a short on the propulsion bus preventing the main bus from reaching its target voltage.
* A short precharge time may be caused by a hybrid/EV battery positive high voltage contactor stuck.
* A short precharge time may be caused by a positive high voltage contactor stuck.
Reference Information
Schematic Reference
Hybrid Energy Storage Schematics Hybrid Energy Storage Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
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
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 Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
1. Vehicle OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
2. Connect the 12 V battery.
3. Disconnect the X2 harness connector at the A28 hybrid/EV battery contactor assembly.
4. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the ground circuit terminal 5 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
5. Vehicle in Service Mode, verify that a test lamp illuminates between the B+ circuit terminal 9 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the A4 hybrid/EV battery pack.
6. Vehicle OFF, disconnect the X1 harness connector at the A28 hybrid/EV battery contactor assembly.
7. Vehicle in Service Mode, test for less than 1 V between the following control circuit terminals and ground.
* Terminal 6
* Terminal 7
* Terminal 9
• If greater than the specified range, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.
8. Vehicle OFF, test for infinite resistance between the following control circuit terminals and ground.
* Terminal 6
* Terminal 7
* Terminal 9
• If less than the specified value, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the K114B hybrid/EV powertrain control module 2.
9. Disconnect the X1 harness connector at the K114B hybrid/EV powertrain control module 2.
10. Test for less than 2 ohm in the control circuit end to end between the following terminals:
* Terminal 6 X1 harness connector at the A28 hybrid/EV battery contactor assembly and terminal 10 X1 harness connector at the K114B hybrid/EV powertrain control module 2.
* Terminal 7 X1 harness connector at the A28 hybrid/EV battery contactor assembly and terminal 3 X1 harness connector at the K114B hybrid/EV powertrain control module 2.
* Terminal 9 X1 harness connector at the A28 hybrid/EV battery contactor assembly and terminal 5 X1 harness connector at the K114B hybrid/EV powertrain control module 2.
• If greater than the specified range, test the appropriate control circuit for an open/high resistance.
11. If all circuits test normal, replace the A4 hybrid/EV battery pack.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Drive Motor Battery Replacement and Shipping Preparation Procedures
* Control Module References Programming and Relearning for hybrid/EV powertrain control module 2 replacement, programming and setup