P0D26
DTC P0D26
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 P0D26
- Battery Charger System Precharge Time Too Long
Circuit/System Description
Before connecting the battery charger to the high voltage battery it is necessary to raise the voltage level of the battery charger output to match the high voltage battery voltage. This is called the precharge of the battery charger. During precharge the charging contactors are closed, but the multi-function contactor is open. Also the cord set needs to be plugged into the hybrid battery charge receptacle and utility power needs to be enabled to the vehicle. The hybrid powertrain control module 2 monitors the amount of time it takes to achieve the proper pre-charge voltage.
Conditions for Running the DTC
* The vehicle 12 V battery system voltage needs to be above 9 V.
* Battery charger must go from disconnected to connected.
* Electronic vehicle supply equipment must be connected and vehicle receiving power.
* The multi-function contactor must be commanded Open.
Conditions for Setting the DTC
The hybrid powertrain control module 2 determines the battery charger control module does not reach its pre-charge voltage within about 10 seconds.
Action Taken When the DTC Sets
* DTC P0D26 is a type A DTCs.
* Disables the high voltage battery charging.
Conditions for Clearing the DTC
DTC P0D26 is a type A 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 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.
1. DTC P1EC5, battery charger or charging system DTCs should not be set.
• If any of the DTCs is set, diagnose first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Verify the scan tool Battery Charger Input parameter is greater than 85 V AC.
• If less than the specified range, disconnect the electronic vehicle supply equipment from the X98 hybrid battery charger receptacle. Disable the high voltage, refer to High Voltage Disabling High Voltage Disabling. Disconnect the X3 connector at the T18 battery charger. Test the following AC circuit terminals for a short ground or an open/high resistance:
* Terminal A X3
* Terminal C X3
Test the AC ground circuit B X3 for an open/high resistance.
3. If all circuits test normal, replace the T18 battery charger.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for battery charger replacement, programming and setup