P0CC3

What it means

P0CC3 is a generic powertrain code meaning the control unit has detected a low voltage or low signal state in the control circuit for the Drive Motor A coolant pump. This pump circulates coolant through the traction motor and often its power electronics on hybrid and electric vehicles. The control unit commands the pump and sees a circuit state that does not match the command, typically a short to ground or an open circuit on the control line.

Symptoms

• Warning light on the dashboard, such as a hybrid or EV system fault light or malfunction indicator
• Reduced power or limp mode to protect the drive motor from overheating
• Drive motor or inverter temperature warning
• Coolant pump not heard running when the system is active
• Vehicle refusing to enter ready mode or ending a drive early in some cases

Possible causes

• Damaged wiring or short to ground in the coolant pump control circuitlikely
• Corroded, loose or damaged connector at the pump or control unitlikely
• Failed coolant pump with an internal short or fault pulling the control line lowlikely
• Blown fuse or relay, or a fault in the pump power supply or earthpossible
• Fault within the control unit driver circuitrare
• Outdated control unit software, only where the manufacturer has issued a bulletin for this faultrare

How to diagnose

1. Read all stored codes and freeze frame data, noting whether other cooling or high voltage system codes are present
2. Check the coolant level and look for leaks, air in the system or contamination, as the procedure and coolant type vary by model
3. Visually inspect the pump wiring and connectors for chafing, heat damage, water ingress and corrosion
4. Check the relevant fuse and relay, and test the pump power and earth supplies against the manufacturer wiring diagram
5. Using the diagnostic tool's active test function if available, command the pump on and listen for or observe operation
6. Measure the control circuit for a short to ground or open circuit with the connector disconnected, following the model-specific procedure
7. Test the pump electrically against the manufacturer specification before replacing it
8. Follow the manufacturer's high voltage safety procedures before working near any orange high voltage cabling or components

How to fix

• Repair or replace damaged wiring in the pump control circuit
• Clean, repair or replace faulty connectors and terminals
• Replace the Drive Motor A coolant pump if it is confirmed faulty, then top up and bleed the cooling system to the manufacturer procedure
• Replace a blown fuse or faulty relay after finding the reason it failed
• Update the control unit software only if a known applicable bulletin exists, or replace the unit if the driver circuit is proven faulty

Can I keep driving?

Nearby codes

• P0CC2GenericDrive Motor A Coolant Pump Control Circuit Range/Performance
• P0CC4GenericDrive Motor A Coolant Pump Control Circuit High