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DTC codes / P0Cxx · Hybrid propulsion / P0CC4

P0CC4Drive Motor A Coolant Pump Control Circuit High

P0CC4 indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for the coolant pump that serves drive motor A, which is the main traction motor in a hybrid or electric vehicle. The circuit is expected to operate within a specific voltage range, and a high reading typically points to an open circuit, a short to voltage, or a faulty pump module.

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

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message
  • Often no symptoms besides the warning light, especially if the pump still runs intermittently
  • Reduced power or limp mode due to motor temperature management strategy
  • Overheating warning for the drive motor or inverter, leading to shutdown
  • Cooling fan may run continuously or not at all depending on fail-safe logic
  • In rare cases, the vehicle may refuse to start or shift into gear

Common causes, most likely first

  1. Open or high-resistance wiring in the coolant pump control circuit, such as a broken wire or poor connector pin fit
  2. Short to voltage on the control circuit, often from chafed insulation contacting a power wire
  3. Faulty coolant pump control module or integrated pump electronics
  4. Corroded or damaged electrical connector at the pump or at the control module
  5. Internal failure of the coolant pump motor causing abnormal current draw and voltage feedback
  6. Powertrain control module software issue or internal driver fault (less common)

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related codes in other modules before proceeding
  2. Inspect the coolant pump connector and control module connector for corrosion, loose pins, or damage
  3. Measure resistance and voltage on the control circuit between the pump and the control module, comparing to manufacturer specifications
  4. Check for shorts to voltage by backprobing the control wire with the key on and pump disconnected
  5. Test the coolant pump directly with a known-good power and ground source to confirm it operates
  6. If the circuit and pump test good, suspect the control module or PCM and follow the manufacturer's diagnostic flow chart
  7. Clear the code and perform a road test to confirm the repair, monitoring live data for the pump control circuit

What the high voltage reading really means

  • A high voltage on a control circuit often indicates an open circuit rather than a short, because the module pulls the line up to a reference voltage when no load is present.
  • Technicians sometimes replace the coolant pump only to find the real fault is a chafed wire harness near a sharp bracket or heat source.
  • The drive motor coolant pump may share a circuit with other pumps or actuators, so a fault in a related component can set this code as a secondary effect.
  • In some vehicles, the pump control module is integrated into the pump assembly, making the entire unit require replacement if the electronics fail.
  • A weak or failing 12-volt battery can cause erratic control module behavior and set this code without any actual circuit fault.

Can I keep driving with P0CC4?

It is generally safe to drive short distances to a repair shop, but avoid heavy acceleration, towing, or long trips because the drive motor may overheat if the coolant pump is not functioning. If the vehicle enters limp mode or shows a high temperature warning, stop driving and seek professional assistance.

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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