DTC P0125: Engine Coolant Temperature Excessive Time To Reach Closed Loop: Description

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

The air flow coming into the engine is accumulated and used to determine if the engine has been driven within conditions that would allow the engine coolant to heat up normally to the thermostat regulating 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 criteria may not run when expected. When excess time is necessary to reach a minimum coolant temperature required for Closed Loop fuel control, DTC P0125 sets.

This DTC is continuously monitored during engine operation.