DTC P0125: Excessive Time To Enter Closed Loop Fuel Control: Description

The Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the Powertrain Control Module (PCM) for engine control and as an enabling criterion for some diagnostics.

The airflow coming into the engine is accumulated and used to determine if the vehicle has been driven within conditions that would allow the engine coolant to heat up normally to the Closed Loop temperature. If the ECT does not increase normally or does not reach regulating temperature of the thermostat, diagnostics that use the ECT as an enabling criterion may not run when expected.

This diagnostic trouble code (DTC) will only run once per ignition cycle within the enabling conditions.

If the PCM detects that more than a calibrated amount of time has been met to reach a minimum coolant temperature required for Closed Loop fuel control, DTC P0125 sets.