Drive Motor Phase U Current Low
The P0A67 code indicates that the current in Phase U of the drive motor is lower than expected. This is typically caused by a faulty motor, wiring issues, or a malfunctioning inverter. The drive motor is a three-phase AC motor, and low current in one phase can lead to reduced performance, jerking, or stalling. This code is common in hybrid and electric vehicles.
1. Symptoms You Will Notice
- Reduced power or acceleration
- Vehicle may jerk or hesitate
- Check engine light illuminated
- Possible stalling or inability to drive
2. Most Common Causes
- Open circuit or high resistance in the phase U wiring of Motor Generator B
- Internal failure of Motor Generator B (open phase U winding)
- Fault in the inverter/converter module (damaged phase U IGBT/MOSFET transistor or gate driver)
- Loose, corroded, or damaged connections at the motor or inverter connector
- Fault in the phase U current sensor (integrated in the inverter)
- Fault in the hybrid system PCM/ECU
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the drive motor wiring and connectors for damage or corrosion.
Step 3: Measure resistance and continuity of Phase U winding using a multimeter.
Step 4: Test the inverter output to the motor with a scope or multimeter.
Step 5: If all else is normal, replace the drive motor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. Low current in a motor phase can cause sudden loss of power or stalling, especially at high speeds. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost varies widely. If it's a wiring issue, it may be $200-$400. If the motor needs replacement, it can be $800-$2000 or more, depending on the vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.