What Does P0C0E Mean?
DTC P0C0E indicates an open circuit or general malfunction in the power supply feeding the drive motor "B" inverter. Similar to P0C0B but affecting the secondary drive motor, this means the "B" inverter is not receiving adequate DC power from the traction battery. In AWD hybrid/EV configurations, motor "B" typically drives the rear axle, so this fault eliminates electric drive on that axle while potentially retaining motor "A" functionality.
Safety Warning
Loss of motor "B" eliminates electric drive on one axle, affecting AWD capability, traction control, and overall propulsion. The vehicle may behave unpredictably in low-traction conditions. Repair by HV-certified technicians only.
Common Causes
30%
Open or blown HV fuse dedicated to motor "B" inverter circuit
25%
Disconnected or damaged HV cable to the motor "B" inverter
20%
Corroded or melted HV connector at inverter "B" input
15%
Failed secondary contactor or relay isolating the "B" inverter supply
10%
Internal failure of the "B" inverter pre-charge circuit
Diagnostic Steps
1
Step 1: Check for related DTCs on the motor "B" system (P0C0F, P0C10, P0C08–P0C0A) and any HV interlock or contactor fault codes. Review freeze-frame data for operating conditions at time of fault.
2
Step 2: Verify that the HV system is commanding power to the "B" inverter. Some systems have separate contactors or fuses for each inverter — confirm the "B" circuit components are functioning.
3
Step 3: Following HV safety lockout procedures, inspect the HV fuse(s) for the motor "B" inverter circuit. Test for continuity and check for signs of overcurrent damage.
4
Step 4: Inspect all HV connectors and cables from the power distribution unit to the "B" inverter. Look for heat damage, loose connections, water intrusion, or physical damage from road debris.
5
Step 5: Measure DC bus voltage at the "B" inverter input with HV-rated equipment while the system is energized. Zero or near-zero voltage confirms an open in the supply path.
Estimated Repair Cost
$500 - $6,000
Parts + labor, varies by vehicle and location
DTC P0C0E indicates an open circuit or general malfunction in the power supply feeding the drive motor "B" inverter. Similar to P0C0B but affecting the secondary drive motor, this means the "B" inverter is not receiving adequate DC power from the traction battery. In AWD hybrid/EV configurations, mo...
The most common cause of P0C0E (Drive Motor "B" Inverter Power Supply Circuit/Open) is: Open or blown HV fuse dedicated to motor "B" inverter circuit
Typical repair costs for P0C0E range from $500 to $6,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of motor "B" eliminates electric drive on one axle, affecting AWD capability, traction control, and overall propulsion. The vehicle may behave unpredictably in low-traction conditions. Repair by HV-certified technicians only.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C0E 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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