P0D2C
DTC P0D2B or P0D2C
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 Descriptors
DTC P0D2B
- Control Pilot Indicator Control Circuit
DTC P0D2C
- Charge Status Indicator Control Circuit
Circuit/System Description
The hybrid power train control module 2 will diagnose its own inputs/outputs for circuit faults (short to ground, short to battery, and open circuit). These DTCs indicate such faults on the output circuits that drive the Control Pilot and Charge Status Indicator LEDs (light emitting diodes) that are located at the center of the dashboard near the windshield.
Conditions for Running the DTC
Condition 1
* The vehicle 12 V battery system voltage needs to be above 9 V.
* Ignition ON
* The Cordset is disconnected (LEDs commanded OFF).
And (both conditions need to run for diagnostic to pass)
Condition 2
* The vehicle 12 V battery system voltage needs to be above 9 V.
* Ignition ON
* The vehicle is connected to an AC supply and the battery charger is charging the vehicle (LEDs commanded ON).
Conditions for Setting the DTC
* LED Commanded OFF, The hybrid powertrain control module 2 detects a short to battery for about 4 seconds.
* LED Commanded ON, The hybrid powertrain control module 2 detects a short to ground or an open/high resistance for about 4 seconds.
Action Taken When the DTC Sets
DTC P0D2B and P0D2C are type B DTCs.
Conditions for Clearing the DTC
DTC P0D2B and P0D2C are type B DTCs.
Reference Information
Schematic Reference
Plug-In Charging Schematics Plug-In Charging Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation
Plug-In Charging System Description and Operation Description and Operation
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
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
EL-48900 - HEV Safety Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Disconnect the cordset. Verify the yellow control pilot LED and the green charge status LED are OFF.
• If either LED is ON, go to Indicator LED Circuit Testing
2. While observing the charge status and control pilot LED, Connect the cordset and start the vehicle high voltage battery charging. Verify the yellow control pilot LED comes on for about 5 seconds and the green charge status LED comes on within 25 seconds.
• If the yellow control pilot LED does not illuminate for about 5 seconds, go to the Control Pilot Circuit Testing.
• If the green charge status LED does not illuminate within the first 25 seconds after starting the battery charging, go to the Charge Status Circuit Testing.
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 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 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.
LED Circuit Testing
1. Cordset disconnected, disable the vehicle high voltage. Refer to High Voltage Disabling High Voltage Disabling. Disconnect the X1 harness connector at the P36 battery state of charge indicator. Test for less than 1.0 V between the following control terminals and ground:
* Terminal A
* Terminal B
• If greater than the specified range, test the appropriate control circuit for a short to voltage. If all circuits tests normal replace the K114B hybrid powertrain control module 2.
2. If all circuits test normal, replace the P36 battery state of charge indicator.
Control Pilot Circuit Testing
1. Ignition OFF, disconnect the X1 harness connector at the P36 battery state of charge indicator.
2. Test for less than 10 ohm between the low reference terminal C and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.
3. Disconnect the cordset for at least 10 seconds. While Connecting the cordset and starting the vehicle high voltage battery charging, verify that a test lamp illuminates between the control pilot signal terminal A and ground during the first 5 seconds of the vehicle charging starting.
• If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.
4. If all circuits test normal, replace the P36 battery state of charge indicator.
Charge Status Circuit Testing
1. Ignition OFF, disconnect the X1 harness connector at the P36 battery state of charge indicator.
2. Test for less than 10 ohm between the low reference terminal C and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.
3. Disconnect the cordset for at least 10 seconds. While connecting the cordset and starting the vehicle high voltage battery charging, verify that a test lamp illuminates between the charge status signal terminal B and ground during the first 25 seconds of the vehicle charging starting.
• If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.
4. If all circuits test normal, replace the P36 battery state of charge indicator.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for battery charger control module replacement, programming and setup