Volt

DTC P1B0F or P1B10

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 generator rotor based on the signals of the resolver-type position sensor. The position sensor contains a drive coil, two driven coils and an irregular shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor generator. At vehicle ON, the motor control module outputs a 7 volt ac, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular shaped rotor. The motor control module then monitors the two driven coil circuits for a return signal. The position of the irregular metallic rotor causes the magnetically-induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coils signals allows the motor control module to determine the exact position, speed and direction of the drive motor rotor. The position sensor is a non-serviceable part of the drive motor.

A measurement called offset is needed for accurate determination of the motor position. Offset is the relationship between the position sensor and the drive motor generator output shaft. Whenever the vehicle is cycled to OFF, the motor control module attempts to learn the offset of the drive motor position sensor by rapidly oscillating the motor and observing the position sensor signals.

Condition 1, 2, 3 and 4

Condition 2

Motor speed is less than 20 RPM.

Condition 1

Position sensor offset value not learned because drive motor speed is greater than 50 RPM.

Condition 2

Position sensor offset value not learned because hybrid battery voltage as observed at the motor control module is less than 192 V.

Condition 3

Position sensor offset value not learned because drive motor phase to phase current difference is less than 15 A.

Condition 4

Position sensor offset value not learned because the offset learn value is greater than the maximum allowed offset of 25 degrees.

If the vehicle is powered-off while driving these DTCs may set.

Scan Tool Reference

Control Module References for scan tool information

1. Vehicle ON, verify that DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E, P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or P1B0D is not set.

⇒	If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Vehicle in Service Mode, observe the scan tool Hybrid Powertrain Control Module 2 contactor system status parameter. The status should display closed.

⇒	If not the specified value, refer to Symptoms - Hybrid Controls .

3. Cycle the vehicle OFF for 2 minutes, ON for 2 minutes then OFF for at least 10 seconds.
4. If the DTC is set, program the T6 power inverter module. If the DTC resets, replace the appropriate M15 drive motor with generator assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.