DTC P0125: Closed Loop Temperature Not Reached: Description

Engine coolant temperature is monitored for 10 minutes after engine is started when battery voltage is more than 10.4 volts. DTC will set when engine coolant temperature does not increase to more than 60°F after 10 minutes. Possible causes are: low coolant level, defective thermostat, defective Engine Coolant Temperature (ECT) sensor, or intermittent fault in ECT sensor wiring.