Drive Motor Inverter Power Supply Circuit Open
The P0C0B code indicates an open circuit in the power supply to the drive motor inverter. This inverter converts DC battery power to AC for the electric drive motor. An open circuit means the electrical path is broken, preventing the inverter from receiving power. This can be caused by a blown fuse, damaged wiring, or a faulty inverter. The vehicle may lose propulsion or exhibit reduced power.
01. Most Common Causes
- Blown fuse or fusible link in the inverter power supply circuit
- Damaged or corroded wiring/connectors between battery and inverter
- Faulty inverter assembly
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Loss of propulsion or reduced motor power
- Vehicle may not start or move
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0C0B and check for related codes.
Step 2: Visually inspect the inverter power supply fuse and replace if blown.
Step 3: Check wiring and connectors for damage, corrosion, or loose connections.
Step 4: Measure voltage at the inverter power input; if absent, trace circuit for open.
Step 5: If power is present, test the inverter per manufacturer procedures.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may lose power unexpectedly, increasing the risk of an accident. Have it towed to a repair shop.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on the cause. A blown fuse is cheap, but replacing an inverter can be expensive.