Possible causes

– Failed Engine Cooling Thermostat
– Engine Cooling Thermostat harness is open or shorted
– Engine Cooling Thermostat circuit poor electrical connection

Tech notes

If there are not coolant system leaks, replaced the thermostat to fix the problem.

When is the code detected?

The P0598 is triggered when there is an open or short thermostat heather control circuit.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)