What are the common causes of P0C08?

An open phase winding inside drive motor B. A damaged or broken motor phase cable. A loose or corroded phase connector. An inverter fault on one phase output.

Inspect the motor B phase cables for damage and chafing. Check the phase connector for corrosion and pushed pins. Measure phase-to-phase continuity and compare the three phases. Check for an open winding in the motor. Replace the damaged cable or motor assembly. Clear the code and retest.

P0C08

Drive Motor B Phase U-V-W Circuit/Open

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0C08 means Drive Motor B Phase U-V-W Circuit/Open.

Check these first

An open phase winding inside drive motor B
A damaged or broken motor phase cable
A loose or corroded phase connector
An inverter fault on one phase output

What to do next

Inspect the motor B phase cables for damage and chafing
Check the phase connector for corrosion and pushed pins
Measure phase-to-phase continuity and compare the three phases
Check for an open winding in the motor
Replace the damaged cable or motor assembly
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-08-30.