P2D0E: Motor Electronics Coolant Pump C Control Module Overtemperature

What it means

Motor electronics coolant pump C reports a control module overtemperature condition. Power electronics cooling is impaired.

At a glance

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

How it works

Pump C’s control module manages the motor electronics coolant pump that circulates coolant through power electronics. It monitors the module’s temperature and sets this code when the module becomes hotter than its permitted operating range.

Common causes

Most likely first.

1. Ambient temperature too high
2. Module cooling path blocked

Symptoms

• Check-engine or hybrid-system warning
• Power limited warning
• Reduced performance under load

How to diagnose it

1. Read freeze-frame data and available pump C module temperature and status data to see when the overtemperature occurred.
2. Check ambient conditions and inspect the pump module’s cooling path for blocked airflow, debris, or other obstructions.
3. With the system safely powered down as specified by the manufacturer, inspect the module and nearby connectors for damage or signs of overheating.
4. Check coolant level, flow, and hoses in the power-electronics cooling circuit for a restriction that could impair heat removal.
5. If the cooling path is clear, verify pump C operation and module temperature-sensor data against the manufacturer’s specifications.

Common fixes

• Clear debris or other blockage from the pump module’s cooling path.
• Restore coolant level or repair a restriction that is reducing cooling flow.
• Repair damaged or poorly connected wiring or connectors at pump C.
• Replace the pump control module if it continues to overheat despite a clear cooling path and correct coolant flow.

Can I keep driving?

Avoid heavy loads and stop if a power-limited or hybrid-system warning appears, since continued overheating can reduce power or impair power-electronics cooling. Arrange prompt diagnosis.