P0125 OBD-II: Insufficient Coolant Temperature for Closed Loop Fuel Control

P0125 Severity

Urgent

Should you fix P0125 yourself?

Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.

Proper diagnosis will save you time and money on unnecessary repairs.

Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.

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What causes OBD-II fault code P0125?

In order for the Powertrain Control Module (PCM) to maintain efficient fuel economy and minimize the emissions output from a vehicle, the engine cooling system must reach a critical operating temperature. This temperature, typically between 160-170 degrees, must be reached within 15 minutes after engine startup. If the weather is extremely cold, the coolant temperature must rise at least 70+ degrees starting temperature. If the coolant temperature does not reach operating temperature, or the temperature wanders excessively from this temperature, the PCM can't accurately and efficiently control fuel economy and emissions. The PCM will set code P0125.

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