P2D00: Motor Electronics Coolant Pump A Stuck/Stalled

What it means

Motor electronics coolant pump A reports a stuck/stalled 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

Motor electronics coolant pump A circulates coolant through components such as the power electronics that need dedicated cooling. The control module monitors pump operation and sets this code when pump A is stuck or stalled, which can reduce cooling and trigger power limits.

Common causes

Most likely first.

1. Pump impeller jammed
2. Motor seized

Symptoms

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

How to diagnose it

1. Read freeze-frame data and live temperatures for the motor electronics coolant loop to see whether temperatures rose when pump A stopped operating.
2. With the system cool, check the coolant level and inspect pump A and its connectors for leaks, damage, or loose wiring.
3. Listen or feel for pump A operation when it is commanded, following the manufacturer's procedure and keeping clear of moving parts.
4. Inspect the pump circuit and connector for wiring damage or poor contact that could prevent the motor from turning.
5. Test pump A and its circuit for a seized motor or stalled impeller using the manufacturer's procedure.

Common fixes

• Correct low coolant or a leak in the motor electronics cooling loop.
• Repair loose or damaged wiring at motor electronics coolant pump A.
• Clear an obstruction from the pump circuit if the manufacturer's procedure permits.
• Replace pump A if its impeller is jammed or its motor is seized.

Can I keep driving?

Power may be limited because the motor electronics can overheat without pump A circulation. Avoid heavy loads and stop if a temperature or power-limited warning appears; continued driving can damage power electronics.