Drive Motor Inverter Power Supply Circuit Open
The P0C0B code indicates an open circuit in the power supply to the drive motor inverter in a hybrid or electric vehicle. This can be caused by a blown fuse, damaged wiring, or a faulty inverter. The inverter converts DC battery power to AC for the drive motor, and an open circuit prevents proper operation, potentially leading to loss of propulsion.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Loss of drive power or reduced acceleration
- Vehicle may not start or move
2. Most Common Causes
- Blown fuse in the inverter power supply circuit
- Damaged or corroded wiring/connectors
- Faulty inverter assembly
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0C0B and check for related codes.
Step 2: Visually inspect fuses and relays for the inverter power supply.
Step 3: Test voltage at the inverter power input connector with a multimeter.
Step 4: Check continuity of wiring between battery, fuse box, and inverter.
Step 5: If power is present, test the inverter output; if not, repair wiring or replace inverter.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with an open power supply circuit can cause sudden loss of propulsion, which is dangerous. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on whether it's a simple fuse replacement or a more complex inverter repair.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.