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

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Engine Coolant Temperature (ECT) sensor monitors temperature of coolant. This input is used by Powertrain Control Module (PCM) for engine control and as an enabling criteria for some diagnostics. Airflow coming into engine is accumulated and used to determine if engine has been driven within normal conditions. That is, conditions that would allow engine coolant to heat up normally to thermostat regulating temperature. If coolant temperature does not increase normally or does not reach regulating temperature of thermostat, problems with diagnostics may occur. Diagnostics that use ECT as an enabling criteria, may not run when expected. This DTC will only run once per ignition cycle within enabling conditions. DTC P0125 will set when there has been excessive time to reach a minimum coolant temperature required for closed loop fuel control.