DTC P0125: Engine Coolant Temperature Excessive Time To Enter Closed-Loop Fuel Control: Description

The Engine Coolant Temperature (ECT) sensor monitors coolant temperature. This input is used by the PCM for engine control and as an enabling criteria for some diagnostics. The airflow coming into the engine is accumulated and used to determine if engine has been driven within conditions that would allow engine coolant to heat up normally to the thermostat regulating temperature. If coolant temperature does not increase normally or does not reach regulating temperature of the thermostat, diagnostics that use engine coolant temperature as enabling criteria, may not run when expected.

DTC will set when there has been excessive time to reach a minimum coolant temperature required for closed-loop fuel control.