P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
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.
A code P0125 may mean that one or more of the following has happened:
- Insufficient warm up time
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty coolant temperature sensor
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty coolant sensor, or a low coolant level).
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