P0125 on Dodge
Insufficient Coolant Temperature for Closed Loop Fuel Control
P0125 on Dodge vehicles indicates insufficient coolant temperature for closed loop fuel control. Au7o has documented this code across 1 Dodge model — most commonly on Neon. This code means the engine is taking too long to reach the operating temperature needed for the computer to enter closed-loop fuel control. The computer uses the coolant temperature sensor to know when the engine is warm enough to trust the oxygen sensors and trim fuel precisely. If the engine stays too cold or the sensor reports a low temperature, this code sets. It commonly results in poor fuel economy, rough cold running, and increased emissions. Typical repair costs on Dodge range from $250 to $700, depending on the specific model and root cause.
Common Causes of P0125
- •Stuck-open thermostat (engine never fully warms)
- •Faulty engine coolant temperature (ECT) sensor
- •Low coolant level
- •Wiring or connector problem at the ECT sensor
- •Engine genuinely running too cold
- •Faulty oxygen sensor delaying closed loop
- •Faulty cooling fan running constantly
P0125 on Dodge by Model
Dodge Neon(1 issue)
- Cooling system weakness — water pump, thermostat, and collapsing lower radiator hose1995-1999
The 2.0L runs a marginal cooling system that is intolerant of neglect, and cooling faults are a leading contributor to the head-gasket failures above. The water pump (timing-belt driven) leaks or seizes, thermostats stick shut, and the lower radiator hose (with an internal anti-collapse spring) can collapse under pump suction at speed, choking flow. The system is also notoriously hard to burp — trapped air causes intermittent overheating even after repairs.
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View P0125 across all makes →Frequently Asked Questions
What does P0125 mean on Dodge?▼
P0125 stands for "Insufficient Coolant Temperature for Closed Loop Fuel Control." This code means the engine is taking too long to reach the operating temperature needed for the computer to enter closed-loop fuel control. The computer uses the coolant temperature sensor to know when the engine is warm enough to trust the oxygen sensors and trim fuel precisely. If the engine stays too cold or the sensor reports a low temperature, this code sets. It commonly results in poor fuel economy, rough cold running, and increased emissions. On Dodge specifically, this code is documented across 1 model.
What causes P0125 on Dodge vehicles?▼
Common causes on Dodge: Stuck-open thermostat (engine never fully warms), Faulty engine coolant temperature (ECT) sensor, Low coolant level, Wiring or connector problem at the ECT sensor, Engine genuinely running too cold. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0125 on a Dodge?▼
Repair costs on Dodge range from $250 to $700, depending on the specific model and root cause.
Which Dodge models have P0125 documented?▼
Au7o has documented P0125 on 1 Dodge model: Neon.