Service Information

Volt

DTC P1B0D or P1B0E

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 P1B0D: Drive Motor 1 Control Module Drive Motor 1 Overspeed

DTC P1B0E: Drive Motor 2 Control Module Drive Motor 2 Overspeed

The drive motor position sensor is monitored by the drive motor control module. The drive motor control module monitors the angular position, speed and direction of the drive motor based on the signals of the resolver-type position sensor. The position sensor allows the drive motor control module to determine the exact position, speed and direction of the drive motor. The motor control modules are part of the power inverter module, often referred to as the drive motor generator power inverter module and are not serviced separately.

Conditions for Running the DTC

•	Vehicle is ON.

•	Drive motor control module temperature and voltage out of range DTCs have not set.

Conditions for Setting the DTC

P1B0D

Drive motor 1 speed is greater than 6,300 RPM.

P1B0E

Drive motor 2 speed is greater than 9,500 RPM.

Action Taken When the DTC Sets

•	DTCs P1B0D and P1B0E are Type A DTCs.

•	The hybrid powertrain control module requests the hybrid powertrain control module 2 to open the high-voltage contactor relays.

Conditions for Clearing the DTC

DTCs P1B0D and P1B0E are Type A DTCs.

Diagnostic Aids

•

The drive axle and drive motor 2 are connected mechanically through a planetary gear set, any condition that allows the front wheel drive shaft to rotate too fast while the transmission is in gear may cause DTC P1B0E to set. Ask the operator if the vehicle was subjected to downhill coasting at an excessive speed.

•	A transmission mechanical failure that occurs during high drive motor generator torque may cause these DTCs to set.

•	Repeated drive motor generator operation at speeds in excess of the DTC limits may cause deterioration of the drive motor generator magnets.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

Verify there are no hybrid Transmission DTCs set.

⇒	If other Hybrid Transmission DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Program the T6 power inverter module with the latest software version. If the DTC resets replace the T6 power inverter module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming and set-up.