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DTC codes / P0Cxx · Hybrid propulsion / P0C5C

P0C5CDrive Motor A Position Sensor Circuit B Circuit Low

P0C5C means the computer that manages the hybrid drive motor has detected an abnormally low voltage on the signal circuit of position sensor B for drive motor A. The sensor reports the rotor position so the inverter can time the motor phases correctly, and a low signal indicates a short to ground, a faulty sensor, or a wiring problem rather than a mechanical motor failure.

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

Symptoms you may notice

  • Illumination of the hybrid system warning light and the check engine light, often with no other noticeable symptoms
  • The vehicle may enter a reduced-power limp mode that limits speed and acceleration
  • The engine may refuse to restart after an auto-stop event because the motor-generator cannot be positioned reliably
  • Rough or juddering operation when the vehicle transitions between electric and engine power
  • In some cases the hybrid system shuts down completely and the car will not move under electric power

Common causes, most likely first

  1. A short to ground in the position sensor B signal wire or its connector, often from chafing or pinched harness insulation
  2. A failed resolver or position sensor B inside drive motor A, typically an open or shorted internal winding
  3. Corroded, loose, or water-intruded pins at the motor position sensor connector
  4. A faulty inverter or motor control module that misreads the sensor signal or supplies a bad reference voltage
  5. Damaged or improperly routed wiring near the motor that has been rubbed through by vibration or road debris
  6. A poor ground connection shared by the sensor circuit, causing the signal to sit lower than expected

How to diagnose and fix it

  1. Scan all hybrid and powertrain modules for stored and pending codes, then record freeze-frame data to confirm the fault is active
  2. Inspect the motor position sensor connector and harness for corrosion, water intrusion, chafing, and loose pins before any parts are replaced
  3. Measure resistance and voltage on the sensor B signal circuit and compare with the manufacturer's specification to isolate a short to ground
  4. Perform a wiggle test on the harness while watching live sensor data to catch an intermittent short that only appears under vibration
  5. Check the sensor reference voltage and ground at the connector; repair any wiring fault found before condemning the sensor
  6. If wiring is good, test the position sensor B winding resistance and replace the sensor or resolver if it is out of specification
  7. After repair, clear the codes and perform a hybrid system relearn or resolver offset calibration as required by the manufacturer

What a low signal really tells you

  • A low signal code almost always points to a wiring short or connector problem rather than a failed motor, so inspect the harness before pricing a motor assembly.
  • Intermittent P0C5C codes that appear only on rough roads or after rain are frequently caused by a chafed signal wire grounding against the motor housing.
  • A weak or shared ground on the sensor circuit can pull the signal voltage low and mimic a failed sensor, so verify ground integrity before replacing parts.
  • Some hybrid controllers set this code when the 12-volt battery is weak during cranking, because the sensor reference voltage drops momentarily; check battery health first.
  • The code does not mean the drive motor itself is mechanically damaged, and replacing the motor without testing the circuit often leaves the fault unresolved.

Can I keep driving with P0C5C?

You can usually drive the vehicle to a repair shop if it remains in limp mode, but avoid sustained high-speed driving and repeated hard acceleration because the motor may lose position sync and cause a sudden shutdown. If the hybrid system disables completely or the car will not restart after an auto-stop, stop driving and arrange a tow.

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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