Wiring fault in the pump control circuit, such as a short to voltage or chafed insulation; Corroded, loose or damaged connector at the pump or control unit; Faulty drive motor coolant pump with an internal electrical fault; Low or blown supply fuse or relay fault feeding the pump circuit; Fault in the control unit output driver (inverter or thermal management module); Outdated control unit software where the manufacturer has issued a known correction.

P0CC4

Drive Motor A Coolant Pump Control Circuit High.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
C4: FaultThe specific fault in that area

What it means

P0CC4 is a generic powertrain code meaning the control unit has detected a high voltage or high signal state in the control circuit for the drive motor A coolant pump on a hybrid or electric vehicle. The control unit commands the pump and monitors the circuit, and the code sets when the feedback does not match the command, typically a short to voltage or an open or faulty driver. The exact pump location, wiring and strategy vary by model.

Symptoms

Warning light on, such as the hybrid system, powertrain or check engine lamp
Drive motor or inverter overheating warning
Reduced power or limp mode
Coolant pump not running or noisy
Reduced performance on hills or when towing
Charging or drive limited on some models

Possible causes

Wiring fault in the pump control circuit, such as a short to voltage or chafed insulationlikely
Corroded, loose or damaged connector at the pump or control unitlikely
Faulty drive motor coolant pump with an internal electrical faultlikely
Low or blown supply fuse or relay fault feeding the pump circuitpossible
Fault in the control unit output driver (inverter or thermal management module)rare
Outdated control unit software where the manufacturer has issued a known correctionrare

How to diagnose

Read all stored and pending codes and note any related coolant pump, inverter or temperature codes
Review freeze frame data for conditions when the fault set, including motor and inverter temperatures
Check the coolant level and condition once the system is cool and safe to work on, following the manufacturer's high voltage safety procedure
Inspect the pump wiring and connectors for chafing, corrosion, water ingress and bent or pushed-back pins
Check the pump fuse and relay, and confirm correct supply and earth voltage at the pump connector
Use a bidirectional scan function if available to command the pump and listen or feel for it running, and watch the commanded and actual values
Measure the control signal at the pump connector with a multimeter or scope, comparing it with the manufacturer's specification
Check for software updates or technical bulletins for your specific model

How to fix

Repair or replace damaged wiring, and fix any short to voltage in the control circuit
Clean, repair or replace corroded or damaged connectors and terminals
Replace the drive motor coolant pump if it is faulty
Replace the failed fuse or relay after finding why it failed
Replace or repair the control unit only after the wiring and pump are proven good
Apply a manufacturer software update if a known calibration fault is confirmed

Can I keep driving?

High severity

Avoid driving if you can, as the drive motor and inverter may overheat without coolant circulation. If the car must be moved, keep it short and gentle and stop if a temperature warning appears.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.