P0125 Code - Insufficient Coolant Temperature for Closed Loop Fuel Control

What Does P0125 Mean?

This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine.

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What are the common causes of P0125 ?

Depending on year, make, and model, DTC P0125 may have number of causes. Here are some of the most common.

• AFR Sensor – If the AFR sensor is stuck lean, has a faulty heater, or is exposed to an exhaust leak, this can trick the ECM into thinking that the engine has not reached operating temperature.

• Typical AFR Signal
• Toyota TSB – Toyota has released at least a couple of TSBs referencing DTC P0125. Barring other cooling system problems, the fix requires AFR sensor replacement or ECM reprogramming. Always check your dealership service center for relevant TSBs before starting diagnosis.
• Cold Weather – In some cases of extreme cold, even with a properly filled cooling system and functional thermostat, the engine simply may not be able to build up enough heat to reach operating temperature. Consider adding a grille cover and additional underhood insulation and coverings to help maintain engine heat. A block heater may also be helpful in certain situations.
• Engine Coolant Level – If there is a leak, faulty coolant return, or the system wasn’t properly bled after a coolant change, the engine may not heat properly.
• Broken Thermostat – If the thermostat is broken, it may allow coolant to flow all the time, that is, always taking heat away from the engine.
• ECT Sensor – If there is corrosion in the ECT sensor circuit, or the ECT sensor is faulty, this may give the ECM false engine coolant temperature readings.

How do you troubleshoot P0125 ?

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.



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