What Does P0C07 Mean?
This code indicates a high-voltage or short-to-power condition in the Drive Motor A three-phase power circuit (U, V, W). The motor controller has detected excessive voltage on one or more motor phases, which can occur from a phase-to-phase short in the motor or cabling, an inverter power stage failure driving a phase to full bus voltage, or a back-EMF anomaly. This creates uncontrolled current flow that can rapidly damage the motor and inverter.
Safety Warning
High voltage on the motor phase circuit indicates a severe electrical fault with fire and electric shock risk. Uncontrolled phase voltages can cause the motor to produce unintended torque, creating a vehicle control hazard. The vehicle must not be driven under any circumstances. Tow to a certified EV service center.
Common Causes
30%
Motor A inverter high-side IGBT/MOSFET failure driving a phase to DC bus voltage
25%
Motor A phase-to-phase winding short creating an internal voltage fault
20%
High-voltage phase cable insulation failure causing phase-to-phase contact
15%
Motor A back-EMF exceeding expected levels due to over-speed or field weakening failure
10%
Inverter gate driver malfunction commanding incorrect switching patterns
Diagnostic Steps
1
Review freeze-frame data for motor speed, DC bus voltage, and torque command at fault time — over-speed conditions can generate excessive back-EMF.
2
With the high-voltage system de-energized, measure phase-to-phase insulation resistance on all three Motor A phase pairs (U-V, V-W, U-W) to detect shorts.
3
Inspect Motor A phase cables for insulation damage, particularly at bend points, conduit entries, and near heat sources.
4
Check the Motor A inverter power stage for IGBT/MOSFET short-circuit failures using the manufacturer's diagnostic procedure.
5
Verify inverter gate driver signals with an oscilloscope to ensure proper PWM switching patterns without shoot-through conditions.
6
If the motor was spinning at the time of failure, check whether the vehicle experienced a sudden deceleration event that could have caused regenerative voltage spikes.
Estimated Repair Cost
$800 - $6,000
Parts + labor, varies by vehicle and location
This code indicates a high-voltage or short-to-power condition in the Drive Motor A three-phase power circuit (U, V, W). The motor controller has detected excessive voltage on one or more motor phases, which can occur from a phase-to-phase short in the motor or cabling, an inverter power stage failu...
The most common cause of P0C07 (Drive Motor "A" Phase U-V-W Circuit High) is: Motor A inverter high-side IGBT/MOSFET failure driving a phase to DC bus voltage
Typical repair costs for P0C07 range from $800 to $6,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
High voltage on the motor phase circuit indicates a severe electrical fault with fire and electric shock risk. Uncontrolled phase voltages can cause the motor to produce unintended torque, creating a vehicle control hazard. The vehicle must not be driven under any circumstances. Tow to a certified EV service center.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C07 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor System
Difficulty
Type
Generic (SAE)
Recommended Tools
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