What are the common causes of P2602?

Control wire shorted to ground. Coolant pump A failed. Corroded pump A connector. Low system voltage. Blown fuse or relay in the coolant pump A circuit.

Check system voltage and battery. Test the coolant pump A control wire for a short to ground. Inspect the pump A connector for corrosion. Command coolant pump A on with a scan tool. Check the coolant pump A fuse and relay. Clear the code and retest.

P2602

Coolant Pump A Control Circuit Low

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P2602 means Coolant Pump A Control Circuit Low.

Where it lives

For P2602, the circuit described runs through the pump. The description of P2602 reports a fault at the pump.

Check these first

Control wire shorted to ground
Coolant pump A failed
Corroded pump A connector
Low system voltage
Blown fuse or relay in the coolant pump A circuit

What to do next

Check system voltage and battery
Test the coolant pump A control wire for a short to ground
Inspect the pump A connector for corrosion
Command coolant pump A on with a scan tool
Check the coolant pump A fuse and relay
Clear the code and retest

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Updated

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