What Does P0C0F Mean?
DTC P0C0F indicates that the DC power supply voltage to drive motor "B" inverter is reading below the expected operating range. This under-voltage condition on the secondary motor inverter can result from the same causes as P0C0C but affecting the "B" motor circuit. The vehicle will limit or disable electric propulsion from motor "B" to prevent inverter damage from operating at insufficient voltage levels.
Safety Warning
Under-voltage operation can cause erratic motor behavior and a high-resistance fault poses a fire risk due to localized overheating. The vehicle should be inspected promptly, especially if a burning smell or heat is detected near HV components.
Common Causes
25%
Traction battery voltage sagging under combined motor load
25%
High-resistance connection in the HV cable to motor "B" inverter
20%
Deteriorated contactor contacts in the motor "B" supply path
15%
HV cable damage or undersized wiring in the "B" inverter circuit
15%
Battery cell imbalance causing reduced pack output voltage
Diagnostic Steps
1
Step 1: Review freeze-frame data noting battery SOC, pack voltage, total power demand, and whether both motors were active at the time of fault. Check for battery health DTCs and motor "A" inverter supply codes.
2
Step 2: Compare the voltage at the battery output versus the motor "B" inverter input under load. A drop exceeding the manufacturer specification indicates a resistance problem in the supply path.
3
Step 3: Inspect the HV connectors, contactors, and fuse holders in the motor "B" supply circuit for signs of heat damage, pitting, or corrosion that would increase resistance.
4
Step 4: If voltage drop is within spec, perform a traction battery capacity and cell balance test. Degraded cells will cause the pack voltage to drop excessively under load.
5
Step 5: Use thermal imaging during a load test to identify hot spots in the HV wiring or connections that indicate high-resistance faults.
Estimated Repair Cost
$400 - $8,000
Parts + labor, varies by vehicle and location
DTC P0C0F indicates that the DC power supply voltage to drive motor "B" inverter is reading below the expected operating range. This under-voltage condition on the secondary motor inverter can result from the same causes as P0C0C but affecting the "B" motor circuit. The vehicle will limit or disable...
The most common cause of P0C0F (Drive Motor "B" Inverter Power Supply Circuit Low) is: Traction battery voltage sagging under combined motor load
Typical repair costs for P0C0F range from $400 to $8,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Under-voltage operation can cause erratic motor behavior and a high-resistance fault poses a fire risk due to localized overheating. The vehicle should be inspected promptly, especially if a burning smell or heat is detected near HV components.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C0F 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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