P2C68: Hybrid/EV Electronics Coolant Pump A Stuck/Stalled

What it means

The hybrid electronics coolant pump A is mechanically stuck or has stalled. Power electronics cooling is severely reduced or absent.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

Hybrid/EV electronics coolant pump A moves coolant through the power-electronics cooling loop. This code sets when the module detects that pump A is stuck or stalled, leaving little or no coolant circulation and sharply reducing electronics cooling.

Common causes

Most likely first.

1. Pump impeller jammed
2. Motor seized

Symptoms

• Check-engine light or hybrid-system warning
• Reduced hybrid power or performance
• Hybrid-system temperature warning

How to diagnose it

1. Read freeze-frame data and live pump A command, speed, and hybrid temperature values to determine whether the pump was commanded on but not turning.
2. Check the vehicle for a hybrid-system temperature warning and inspect the pump A loop for leaks or an obvious coolant-flow obstruction.
3. With the system made safe according to the manufacturer's high-voltage procedures, inspect pump A wiring, connector, and grounds for damage or loose contact.
4. Check pump supply and ground under load against the manufacturer's specification.
5. If electrical supply is correct, test the pump impeller and motor for a jam or seizure using the manufacturer's procedure.

Common fixes

• Repair a loose or damaged pump A connector, power wire, or ground.
• Correct a confirmed obstruction in the coolant loop.
• Replace pump A if its impeller is jammed or motor has seized.
• Refill and bleed the affected loop according to the manufacturer's procedure after repairs.

Can I keep driving?

Do not continue driving if the hybrid-system temperature warning is on or power is reduced; a stalled pump can quickly overheat and damage power electronics. Arrange safe recovery if the warning persists.