P1B42 CHEVROLET – Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Performance

P1B42 CHEVROLET Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1B42 CHEVROLET Possible Causes

Faulty Hybrid/Electric Vehicle Battery Pack

P1B42 CHEVROLET Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid/EV powertrain control module 1. Two of the motor control modules operate their respective drive motor based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump. The motor control modules and the hybrid/EV powertrain control module 1 are part of the power inverter module and are not serviced separately. The motor control modules test for isolation between each high voltage bus and vehicle chassis whenever high voltage is present at the power inverter module.