Drive Motor Phase U-V-W Circuit High
The P0C07 code indicates that the powertrain control module has detected a high voltage or resistance condition in the three-phase circuit (U, V, W) of the drive motor. This typically points to a short circuit, open circuit, or faulty motor windings, which can cause the motor to operate inefficiently or fail. The issue is common in hybrid and electric vehicles with high-voltage traction motors.
01. Most Common Causes
- Short circuit in motor phase wiring
- Open circuit in motor phase wiring
- Faulty drive motor windings
- Damaged motor inverter or controller
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or performance
- Vehicle may enter limp mode
- Unusual noises from the drive motor
03. Step-by-Step Diagnosis
Step 1: Use a multimeter to measure resistance between each phase (U-V, V-W, W-U) at the motor connector; compare to specifications.
Step 2: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Check the motor inverter/controller for fault codes and perform a functional test.
Step 4: If wiring and inverter are okay, test the motor windings for shorts or opens using an insulation resistance tester.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The high voltage condition can cause further damage to the motor or inverter, and the vehicle may lose power unexpectedly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary widely: wiring repairs $100-$300, motor replacement $1,000-$3,000, inverter replacement $500-$2,000.