P2D03: Motor Electronics Coolant Pump A Supply Voltage Circuit

Motor electronics coolant pump A reports a supply voltage circuit condition. Power electronics cooling is impaired.

Medium severity. Can I keep driving?Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

Most likely causes

Supply fuse blown
Wiring or connector fault

What to check, in order

Start with the simplest. You can tick off each step.

With the engine cold, check the coolant level; never do this when the system is hot
Check the actual temperature in live data
Make sure the fan comes on when it should
Check the thermostat and connector
Measure the sensor and replace it if its readings do not make sense

Good to know

Repair difficulty: hard
It can trigger limp mode.

What each character of P2D03 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
D: Subsystem depends on the code range
03: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2D03?

Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

What causes code P2D03?

The most common causes are: supply fuse blown; wiring or connector fault.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.