P0125 CHEVROLET - Insufficient Coolant Temperature for Closed Loop Fuel Control
Low engine coolant level
Leaking or stuck open thermostat
Faulty Engine Coolant Temperature (ECT) sensor
Engine Coolant Temperature (ECT) sensor harness is open or shorted
Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
When is the code detected?
The voltage sent to Powertrain Control Module (PCM) from the Engine Coolant Temperature (ECT) sensor is not practical, even when some time has passed after starting the engine. The engine is taking too long to reach the normal temperature level.
Engine Light ON (or Service Engine Soon Warning Light)
P0125 Chevrolet Description
The Powertrain Control Module (PCM
) monitors the Engine Coolant Temperature (ECT
) sensor in order to determine how long it takes the engine to reach the coolant temperature required for Closed Loop operation. Diagnostic Trouble Code (DTC) P0125 sets if the PCM
determines that the engine does not reach Closed Loop temperature in a specified amount of time. This test will not run if either the intake air or engine coolant temperature is too low at start-up. The PCM
will only run this DTC on a cold start and only once per cold start.