Service Information

Volt

DTC P0D26

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0D26: Battery Charger System Precharge Time Too Long

Before connecting the battery charger to the hybrid/EV battery pack it is necessary to raise the voltage level of the battery charger output to match the hybrid/EV battery pack 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 drive motor battery charger cable needs to be plugged into the hybrid battery charge receptacle and utility power needs to be enabled to the vehicle. The hybrid/EV 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.

•	Drive motor battery charger cable must be connected and vehicle receiving power.

•	The multi-function contactor must be commanded Open.

Conditions for Setting the DTC

The hybrid/EV powertrain control module 2 determines the battery charger does not reach its pre-charge voltage within about 10 seconds.

Action Taken When the DTC Sets

•	DTC P0D26 is a type A DTC.

•	Disables the high-voltage battery charging.

Conditions for Clearing the DTC

DTC P0D26 is a type A DTC.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

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 conditions 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 goggles with appropriate side shields when within 15 metres (50 feet) of the vehicle, either indoors or outdoors.

•	Certified and up-to-date Class "0" Insulation gloves rated at 1000 V 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 energised or not.

Failure to follow the procedures exactly as written may result in serious injury or death.

Verify DTC P1EC5 is not set.

⇒	If DTC P1EC5 is set, refer to DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0D0A, P0D11, P1EBC-P1EBF, P1EC0 or P1EC3-P1EC5

Verify that no other battery charger DTCs are set.

⇒	If any of the DTCs is set, diagnose first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If all circuits test normal, replace the T18 battery charger.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References T18 battery charger replacement, programming and set-up