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

An Engine Coolant Temperature (ECT) sensor monitors the coolant temperature. The Powertrain Control Module (PCM) uses this input for engine control, and for an enabling criteria for some diagnostics. The air flow coming into the engine is accumulated. The air flow is used in order to determine if the engine has been driven within conditions that would allow the engine coolant to heat normally to the thermostat-regulating temperature. If the coolant temperature does not increase normally, or if the coolant temperature does not reach regulating temperature of the thermostat, diagnostics that use engine coolant temperature as enabling criteria may not run when expected. This Diagnostic Trouble Code (DTC) will only run once per ignition cycle, within the enabling conditions. This DTC will set when there has been excessive time to reach Closed Loop fuel control.