What are the common causes of U0698?

Coolant pump E dropping off the communication bus. A broken or shorted wire in the pump E control circuit. Corrosion or coolant in the pump E connector. A failed pump motor or driver inside pump E. Loss of power or ground at coolant pump E.

Check for power and ground at coolant pump E. Inspect the pump E connector for corrosion or coolant. Test the pump E control wire for opens and shorts. Command pump E on with a scan tool and watch for a response. Replace coolant pump E if it stays silent. Clear the code and retest.

U0698

Lost Communication with Coolant Pump “E”

System: Network communication (U code)
Lamp: Check Engine Light
Category: Network Communications

What it means

U0698 means Lost Communication with Coolant Pump “E”.

Where it lives

For U0698, the description names the pump as the part involved.

Check these first

Coolant pump E dropping off the communication bus
A broken or shorted wire in the pump E control circuit
Corrosion or coolant in the pump E connector
A failed pump motor or driver inside pump E
Loss of power or ground at coolant pump E

What to do next

Check for power and ground at coolant pump E
Inspect the pump E connector for corrosion or coolant
Test the pump E control wire for opens and shorts
Command pump E on with a scan tool and watch for a response
Replace coolant pump E if it stays silent
Clear the code and retest

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Updated

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