What Does P0C61 Mean?
This code is set when drive motor "B" position sensor circuit "B" signal voltage drops below the controller's minimum threshold. This is a hard electrical fault—either a short to ground, an open signal wire, or an internally failed sensor is pulling the circuit B output low. Motor B operation will be significantly impacted, with the controller likely reducing or disabling motor B torque output.
Safety Warning
A low signal fault on motor B's position sensor circuit B will prevent accurate commutation. The vehicle may lose secondary motor drive power, affecting total performance and potentially AWD functionality. Repair before sustained driving.
Common Causes
32%
Short to ground in the circuit B signal wiring for motor B
26%
Open circuit in the circuit B signal or return wire
22%
Internal sensor failure with collapsed output on the B channel
13%
Water damage or corrosion at the motor B sensor connector
7%
Controller input stage failure on the motor B circuit B channel
Diagnostic Steps
1
Inspect the motor B position sensor connector for moisture, corrosion, or debris—this sensor is often exposed to road spray and temperature extremes.
2
Measure voltage at the sensor connector to verify the excitation supply is present and within range for circuit B.
3
With the sensor disconnected, test each circuit B wire for short to ground using a multimeter set to resistance mode.
4
Check continuity of each circuit B wire from the sensor to the controller to identify open circuits.
5
If the harness is verified good, measure the circuit B winding resistance at the sensor—compare against manufacturer specifications for an internal fault.
Estimated Repair Cost
$300 - $1,800
Parts + labor, varies by vehicle and location
This code is set when drive motor "B" position sensor circuit "B" signal voltage drops below the controller's minimum threshold. This is a hard electrical fault—either a short to ground, an open signal wire, or an internally failed sensor is pulling the circuit B output low. Motor B operation will b...
The most common cause of P0C61 (Drive Motor "B" Position Sensor Circuit "B" Low) is: Short to ground in the circuit B signal wiring for motor B
Typical repair costs for P0C61 range from $300 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A low signal fault on motor B's position sensor circuit B will prevent accurate commutation. The vehicle may lose secondary motor drive power, affecting total performance and potentially AWD functionality. Repair before sustained driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C61 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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