What are the common causes of P0A05?

An open in the coolant pump A control circuit. A failed coolant pump A motor. Corrosion in the coolant pump A connector. A blown coolant pump fuse or relay. Low coolant level.

Check coolant level. Check the coolant pump A fuse and relay. Inspect the coolant pump A connector. Test the pump A control circuit for opens. Command coolant pump A with a scan tool. Clear the code and retest.

P0A05

Motor Electronics Coolant Pump A Control Circuit/Open

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0A05 means Motor Electronics Coolant Pump A Control Circuit/Open.

Where it lives

For P0A05, the circuit described runs through the pump. The description of P0A05 reports the pump as open.

Check these first

An open in the coolant pump A control circuit
A failed coolant pump A motor
Corrosion in the coolant pump A connector
A blown coolant pump fuse or relay
Low coolant level

What to do next

Check coolant level
Check the coolant pump A fuse and relay
Inspect the coolant pump A connector
Test the pump A control circuit for opens
Command coolant pump A with a scan tool
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.