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DTC codes / P2Cxx · Hybrid propulsion / P2C6C

P2C6CDrive Motor "A" Phase Y Current

P2C6C indicates that the hybrid or electric vehicle's control module has detected an abnormal current reading on the Y phase of drive motor 'A', which is the main traction motor responsible for propulsion. The computer compares the commanded current with the actual current measured by the phase current sensor and sets this code when the values deviate beyond a calibrated threshold, signaling a potential fault in the motor, inverter, or wiring.

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

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message, often with no other noticeable symptoms
  • Reduced power output or limp mode, limiting vehicle speed and acceleration
  • The vehicle may refuse to start or shift into gear, especially in hybrid models where the motor is integral to the drivetrain
  • Intermittent hesitation or shuddering during acceleration or regenerative braking
  • Unusual noises such as whining or clicking from the motor area during operation
  • Possible overheating warning if the fault causes excessive current draw

Common causes, most likely first

  1. Faulty phase current sensor or its wiring harness on the Y phase of drive motor 'A'
  2. Damaged or shorted motor stator windings, leading to unbalanced current
  3. Defective inverter or power module internal to the drive motor assembly
  4. Corroded, loose, or damaged electrical connectors between the motor and the control module
  5. Software calibration issue in the motor control module requiring a reflash or update
  6. A failed motor control module itself, though this is less common

How to diagnose and fix it

  1. Perform a visual inspection of the motor, inverter, and all related wiring for signs of damage, corrosion, or loose connections
  2. Use a scan tool to retrieve all stored codes and freeze-frame data, then clear codes and test-drive to see if P2C6C returns
  3. Check the phase current sensor signal with an oscilloscope or multimeter according to manufacturer specifications, comparing it to expected values
  4. Inspect the motor stator windings for continuity and resistance imbalances between phases using a multimeter
  5. Verify the integrity of the wiring harness from the current sensor to the control module, looking for opens, shorts, or high resistance
  6. If the sensor and wiring are good, test the inverter and motor control module with specialized diagnostic equipment or substitute with a known-good unit
  7. Repair or replace the faulty component as needed, then clear codes and verify the repair with a test drive

Phase Current Sensor Faults Mimic Motor Failures

  • A failing phase current sensor often produces symptoms identical to a bad motor, leading to unnecessary motor replacement when only the sensor is at fault.
  • The code can be set by a poor connection at the motor connector that causes intermittent signal loss, so always wiggle-test connectors while monitoring live data.
  • Some vehicles set P2C6C after a low-voltage event or battery replacement, requiring a relearn procedure rather than any hardware repair.
  • The Y phase designation refers to one of the three motor phases, and a fault here may also trigger codes for other phases if the issue is in the inverter.
  • Aftermarket performance tuners or incorrect software can alter current limits and cause this code to set falsely, so verify the vehicle has not been modified.

Can I keep driving with P2C6C?

It is not safe to continue driving with this code because the vehicle may enter limp mode unexpectedly or lose propulsion power, increasing the risk of a crash. Have the vehicle towed to a qualified repair facility for diagnosis and repair.

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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