What Does P0C5F Mean?
This code indicates a general malfunction in the "B" position sensor circuit for drive motor "B" in a hybrid or electric vehicle. With circuit B of motor B's resolver or encoder reporting a fault, the controller loses one channel of redundant position data for the secondary drive motor. The system may attempt single-channel operation but will likely reduce motor B's output or disable it entirely to maintain safe operation.
Safety Warning
Loss of position sensor circuit B on motor B removes sensor redundancy. While the vehicle may still operate on motor A alone, reduced total drive power and loss of AWD capability (if applicable) affect handling and safety. Professional repair required.
Common Causes
30%
Damaged or corroded wiring/connector in motor B position sensor circuit B
27%
Failed resolver circuit B winding in drive motor B
18%
Inverter control module input fault on the motor B circuit B channel
14%
Electromagnetic interference affecting the circuit B signal path
11%
Mechanical sensor mounting issue or air gap problem on motor B
Diagnostic Steps
1
Check whether circuit A codes (P0C55-P0C59) are also present for motor B—simultaneous faults suggest a harness or connector issue rather than an individual channel failure.
2
Inspect the circuit B wiring and connector at both the sensor end and the controller end for physical damage or contamination.
3
Measure resolver circuit B winding resistance and compare against circuit A windings and manufacturer specifications.
4
Verify the excitation signal is reaching the resolver and producing proper output on both the sine and cosine lines of circuit B.
5
Check the cable shield and drain wire for circuit B—a compromised shield can allow noise to corrupt the signal.
Estimated Repair Cost
$400 - $2,200
Parts + labor, varies by vehicle and location
This code indicates a general malfunction in the "B" position sensor circuit for drive motor "B" in a hybrid or electric vehicle. With circuit B of motor B's resolver or encoder reporting a fault, the controller loses one channel of redundant position data for the secondary drive motor. The system m...
The most common cause of P0C5F (Drive Motor "B" Position Sensor Circuit "B") is: Damaged or corroded wiring/connector in motor B position sensor circuit B
Typical repair costs for P0C5F range from $400 to $2,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of position sensor circuit B on motor B removes sensor redundancy. While the vehicle may still operate on motor A alone, reduced total drive power and loss of AWD capability (if applicable) affect handling and safety. Professional repair required.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C5F 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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