Possible causes

– Low coolant level
– Faulty Engine Coolant Temperature Sensor
– Stuck or leaking thermostat
– Engine Coolant Temperature Sensor harness is open or shorted
– Engine Coolant Temperature Sensor circuit poor electrical connection

Symptoms

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

P2185 Information for specific makes

P2185 DODGE
P2185 FORD
P2185 ACURA
P2185 HONDA
P2185 BMW
P2185 CHRYSLER
P2185 AUDI
P2185 VOLKSWAGEN