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DTC codes / P0Cxx · Hybrid propulsion / P0C0D

P0C0DDrive Motor A Inverter Power Supply Circuit High

P0C0D indicates that the hybrid or electric vehicle control module has detected an abnormally high voltage on the power supply circuit feeding the inverter for drive motor A. The inverter converts high-voltage direct current (DC) from the traction battery into alternating current (AC) for the motor, and a high supply circuit reading means the voltage is above the expected range, which can prevent the motor from operating correctly.

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
  • Reduced power or limp mode, limiting vehicle speed
  • The vehicle may refuse to start or shift into gear
  • Audible warnings or chimes from the instrument cluster
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. A weak or failing 12-volt auxiliary battery causing incorrect reference voltage
  2. Corroded, loose, or damaged wiring or connectors in the inverter power supply circuit
  3. A faulty inverter assembly internal to the drive motor unit
  4. A malfunctioning hybrid/EV control module or power management module
  5. High-voltage cable damage or poor connection at the inverter
  6. A short to voltage in the supply circuit due to chafed wiring
  7. A failed voltage sensor or current sensor within the inverter

How to diagnose and fix it

  1. Perform a thorough visual inspection of the 12-volt battery, its terminals, and the inverter power supply wiring for corrosion or damage
  2. Test the 12-volt battery and charging system to ensure stable voltage, as low system voltage can cause false high-voltage readings
  3. Use a scan tool to check for related codes and freeze-frame data to understand the conditions when the fault set
  4. Disconnect the high-voltage system safely and inspect the inverter connectors and cables for tightness and signs of arcing
  5. Measure the supply voltage at the inverter connector with a multimeter and compare to specifications
  6. If voltage is abnormally high, test the inverter's internal voltage sensor and replace the inverter if faulty
  7. Repair or replace any damaged wiring or connectors, then clear codes and verify the repair with a test drive

Don't overlook the 12-volt battery

  • A weak 12-volt battery is a common cause of this code because the hybrid control module uses it as a reference, and low voltage can skew the inverter supply readings.
  • The code does not always mean the inverter itself has failed; wiring issues or connector corrosion often mimic an inverter fault.
  • Intermittent high-voltage readings can be caused by loose ground connections, so check all grounds in the inverter circuit before condemning expensive components.
  • Some vehicles set this code when the high-voltage battery is deeply discharged or has a cell imbalance, so check the traction battery state of charge as well.

Can I keep driving with P0C0D?

Do not continue driving with this code set, as the vehicle may enter limp mode or shut down unexpectedly, and high-voltage system faults can be dangerous. Have the vehicle inspected by a qualified technician before driving further.

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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