What Does P0C10 Mean?
DTC P0C10 indicates that the DC power supply voltage to drive motor "B" inverter is exceeding the maximum safe operating level. This over-voltage on the "B" inverter bus typically occurs during regenerative braking events when the returned electrical energy raises the bus voltage beyond the rated capacity. The inverter will shut down to protect its power semiconductors and capacitors from damage due to the excessive voltage.
Safety Warning
Over-voltage can permanently damage the inverter and may cause sudden loss of regenerative braking, leaving only friction brakes. If the bus capacitors fail from over-voltage, a thermal event is possible. Do not operate the vehicle until diagnosed.
Common Causes
30%
Excessive regenerative braking energy with battery near full charge
25%
BMS fault not limiting regen when battery SOC is high
20%
Defective bus voltage clamping circuit in the inverter
15%
Faulty HV bus voltage sensor providing incorrect readings
10%
Software calibration error in regen torque limiting strategy
Diagnostic Steps
1
Step 1: Review freeze-frame data for battery SOC, bus voltage, motor RPM, and regen torque at the time of fault. Determine if the vehicle was decelerating or descending a grade.
2
Step 2: Check for companion DTCs on the motor "A" inverter (P0C0D), battery management system, and regenerative braking control modules.
3
Step 3: Monitor real-time HV bus voltage during controlled deceleration events. If voltage rises above the rated maximum, the regen torque limiting strategy is not functioning correctly.
4
Step 4: Verify BMS is correctly communicating maximum charge voltage and SOC limits to the motor controllers. A communications fault may allow uncontrolled regen charging.
5
Step 5: Check for manufacturer TSBs or software updates related to regen braking calibration for this model. Many over-voltage issues are resolved with updated control software.
Estimated Repair Cost
$300 - $5,000
Parts + labor, varies by vehicle and location
DTC P0C10 indicates that the DC power supply voltage to drive motor "B" inverter is exceeding the maximum safe operating level. This over-voltage on the "B" inverter bus typically occurs during regenerative braking events when the returned electrical energy raises the bus voltage beyond the rated ca...
The most common cause of P0C10 (Drive Motor "B" Inverter Power Supply Circuit High) is: Excessive regenerative braking energy with battery near full charge
Typical repair costs for P0C10 range from $300 to $5,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Over-voltage can permanently damage the inverter and may cause sudden loss of regenerative braking, leaving only friction brakes. If the bus capacitors fail from over-voltage, a thermal event is possible. Do not operate the vehicle until diagnosed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C10 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor Inverter
Difficulty
Type
Generic (SAE)
Recommended Tools
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