Temperature Sensor

  Depending on the vehicle, the Coolant Temperature Sensor (sometimes referred to as a coolant temperature switch as well) can serve a few different roles: input for the engine computer, readings for instrument clusters, and a switch for the radiator cooling fans.  While modern vehicles get all 3 of these readings from the same sensor, it was not uncommon for older vehicles to have one sensor for each use.  If one of these sensors fails, you may experience overheating, an unresponsive temperature gauge, or cooling fan that refuses to turn on.

 

OBDII Check Engine Codes related to Coolant Temperature Sensors

P0115 Engine Coolant Temperature Circuit Malfunction
P0116 Engine Coolant Temperature Circuit Range/Performance Problem
P0117 Engine Coolant Temperature Circuit Low Input
P0118 Engine Coolant Temperature Circuit High Input
P0119 Engine Coolant  Temperature Circuit Intermittent
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
P0126 Insufficient Coolant Temperature for Stable Operation
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0217 Engine Overtemp Condition

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