P2181 OBD-II: Cooling System Performance
P2181 Severity
Should you fix P2181 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.
What causes OBD-II fault code P2181?
The engine computer (PCM) monitors coolant temperature in the radiator (Radiator Coolant Temperature Sensor) and in the engine (Engine Coolant Temperature Sensor). On cold startup, the PCM will compare these to readings to verify proper operation of thermostat. If the temperature difference is not within specifications, code P2181 will set.
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