Open circuit, damaged or chafed wiring in the pump control or supply wiring; Corroded, loose or pushed-out terminals at the pump connector; Failed coolant pump motor or its integral electronics; Blown fuse or faulty relay in the pump supply; Fault in the controlling unit's output driver (inverter or motor control unit, or thermal management module); Water ingress into the connector or pump housing.

P0CC1

Drive Motor A Coolant Pump Control Circuit/Open.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
C1: FaultThe specific fault in that area

What it means

P0CC1 means the control unit has detected a fault in the control circuit of the drive motor 'A' coolant pump, specifically an open circuit. It applies to hybrid and electric vehicles that use a dedicated coolant loop for the traction motor and power electronics. The control unit commands the pump but sees no valid response on the control circuit, such as no current or a signal outside the expected range.

Symptoms

Hybrid or EV system warning light or malfunction indicator on the dashboard
Reduced power or limp-home mode, especially under load or in hot weather
Drive motor or inverter over-temperature warning
Coolant pump not heard running when the system is powered up
Reduced or limited charging or regeneration on some models

Possible causes

Open circuit, damaged or chafed wiring in the pump control or supply wiringlikely
Corroded, loose or pushed-out terminals at the pump connectorlikely
Failed coolant pump motor or its integral electronicslikely
Blown fuse or faulty relay in the pump supplypossible
Fault in the controlling unit's output driver (inverter or motor control unit, or thermal management module)rare
Water ingress into the connector or pump housingpossible

How to diagnose

Read all stored codes and freeze frame data, noting temperatures, vehicle speed and system state when the fault set, and check for related coolant, temperature or pump speed codes.
Check the drive motor coolant level and look for leaks, as low coolant can cause other pump faults.
Visually inspect the pump wiring and connector for chafing, corrosion, water ingress, bent or pushed-out pins and heat damage.
Check the relevant fuse and relay, if fitted, for condition and correct supply voltage.
With a suitable scan tool, command the pump on in a live data test and see if it runs and whether the commanded and actual values match.
Test the control circuit for continuity, short to ground and short to supply between the pump and control unit, following the manufacturer's wiring information and only with the system in a safe state.
Check the supply and ground at the pump connector while commanded, to separate a wiring fault from a failed pump.
Follow the manufacturer's procedure for high-voltage safety before any work near orange cables or power electronics; this must be done by a suitably trained technician.

How to fix

Repair or replace damaged wiring and renew any faulty connector terminals
Clean, dry and properly reseat corroded or wet connectors
Replace the coolant pump if it fails its commanded test or has no response
Replace the blown fuse or faulty relay after finding why it failed
Top up or refill and bleed the drive motor cooling circuit to the manufacturer's procedure after any repair
Repair or replace the controlling unit only after the wiring and pump have been proven good, and as the manufacturer specifies

Can I keep driving?

Medium severity

Short, gentle journeys may be possible if no over-temperature warning appears, but the motor and power electronics could overheat without proper cooling. Stop and seek help if a temperature warning shows or power drops noticeably, and have it repaired soon.

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