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DTC codes / P0Cxx · Hybrid propulsion / P0C47

P0C47Hybrid/EV Battery Pack Coolant Pump A Control Circuit/Open

P0C47 indicates that the hybrid or electric vehicle battery pack coolant pump A control circuit is open, meaning the powertrain control module has detected no continuity on the command wire to the pump. The computer expects a complete path to ground through the pump motor or its control module, and an open circuit prevents the pump from receiving power or ground.

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

Symptoms you may notice

  • Illumination of the hybrid system warning light or service vehicle soon message
  • Often no symptoms besides the warning light, especially if the pump has failed in a way that does not immediately overheat the pack
  • Reduced hybrid system power or a forced limp mode if the battery pack temperature rises
  • Active grille shutters may stay open or cooling fans may run constantly as the system tries to protect the battery
  • A noticeable lack of cabin heat or poor air conditioning performance if the coolant loop also serves the climate system
  • In rare cases, the vehicle may refuse to start or shift into gear when the battery pack temperature is out of range

Common causes, most likely first

  1. Broken or corroded wire in the coolant pump control circuit, often near a connector or where the harness flexes
  2. Failed coolant pump A, either an open motor winding or a failed internal control module
  3. Loose, backed-out, or water-intruded electrical connector at the pump or at the control module
  4. Blown fuse or failed relay that supplies power to the coolant pump circuit
  5. Faulty powertrain control module driver for the pump circuit, though this is less common
  6. High resistance or an open in the ground circuit for the pump, including a poor chassis ground point

How to diagnose and fix it

  1. Connect a scan tool and record all stored and pending codes, then clear codes and verify whether P0C47 returns immediately
  2. Visually inspect the coolant pump connector and the harness for chafing, corrosion, or pushed-out terminals, and check the pump fuse and relay
  3. Disconnect the pump and use a multimeter to measure resistance across the pump motor terminals, comparing to the manufacturer's specification
  4. With the pump disconnected and the key on, back-probe the control circuit at the pump connector to check for the expected command voltage or ground signal
  5. Perform a voltage drop test on both the power and ground sides of the circuit while the pump is commanded on to reveal hidden resistance
  6. If the circuit tests good but the pump does not run when commanded, substitute a known-good pump or use a bidirectional scan tool to command the pump on
  7. Repair or replace the faulty wiring, connector, fuse, relay, or pump as needed, then clear codes and verify the pump runs and the code stays cleared

What the open circuit really tells you

  • An open circuit code does not always mean the pump is dead; a corroded connector pin or a broken wire a few inches from the pump is just as common and far cheaper to fix.
  • Many hybrid coolant pumps are three-phase brushless units, so a simple resistance check across two terminals may not reveal a failed pump; always follow the service information for the specific pump type.
  • A failed pump can set this code without ever overheating the pack during a short drive, so the absence of overheating symptoms does not confirm the pump is working.
  • The same coolant loop often cools the inverter and the cabin heater, so a pump fault can cause climate control complaints that seem unrelated to the battery.
  • After replacing a pump, some vehicles require a coolant bleed procedure or a pump learn routine with a scan tool, and skipping it can set the code again or cause overheating.

Can I keep driving with P0C47?

You can usually drive a short distance to a repair shop, but avoid heavy acceleration, long climbs, and fast charging because those conditions heat the battery pack quickly. If the hybrid system warning turns red or the vehicle enters limp mode, stop and have it towed.

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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