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DTC codes / P0Cxx · Hybrid propulsion / P0C61

P0C61Drive Motor B Position Sensor Circuit B Circuit Low

P0C61 indicates that the hybrid or electric vehicle control module has detected an abnormally low voltage signal on circuit B of the position sensor for drive motor B, which is the motor responsible for propulsion or regeneration. The computer compares this signal against expected values and flags the code when the voltage stays below the calibrated threshold for a set time, indicating a short to ground, an open circuit, or a faulty sensor.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the hybrid system warning light or service vehicle soon message
  • Reduced power or limp-home mode with limited motor output
  • Failure of the vehicle to enter or maintain electric-only drive
  • Intermittent hesitation or shudder during acceleration or regenerative braking
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Damaged or corroded wiring harness or connector at the drive motor B position sensor
  2. Internal failure of the drive motor B position sensor (winding open or shorted)
  3. Poor electrical ground connection for the sensor or motor assembly
  4. Contamination or debris interfering with the sensor reluctor or magnetic target
  5. Faulty hybrid control module or inverter assembly not supplying proper reference voltage
  6. Mechanical damage to the sensor mounting or air gap due to vibration or impact

How to diagnose and fix it

  1. Connect a scan tool and record all stored codes and freeze-frame data to confirm P0C61 is current and not history
  2. Visually inspect the sensor connector, pins, and wiring for corrosion, chafing, or loose terminals, and repair as needed
  3. Measure reference voltage and ground at the sensor connector with a digital multimeter to verify the circuit is not shorted or open
  4. Check the sensor signal voltage while slowly rotating the motor by hand (if accessible) to see if the signal changes smoothly
  5. Compare the sensor B signal with sensor A (if equipped) or with a known-good waveform using an oscilloscope to isolate a faulty sensor
  6. Replace the drive motor B position sensor if electrical tests confirm it is out of specification, then clear codes and perform a relearn or calibration procedure
  7. If the fault persists after sensor replacement, inspect the hybrid control module and its connectors for internal shorts or software issues

What a low signal on motor B really means

  • A low voltage on circuit B often results from a short to ground in the harness rather than a failed sensor, so always check wiring before replacing parts.
  • Intermittent P0C61 codes can be caused by a poor ground at the motor housing, which is frequently overlooked during diagnosis.
  • The position sensor may share a reference voltage with other sensors, so a fault in a neighbouring circuit can drag the signal low and set this code.
  • After replacing the sensor, some vehicles require a position offset relearn or a full hybrid system calibration to prevent the code from returning.
  • This code does not always indicate a hard failure; a weak battery or low 12-volt supply can cause erratic sensor signals and set P0C61 intermittently.

Can I keep driving with P0C61?

You can usually drive the vehicle to a service location, but expect reduced power and possible limp-home mode, so avoid highway speeds and heavy acceleration. If the warning light flashes or multiple hybrid faults appear, stop driving and seek professional diagnosis to prevent further damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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