B2459 – Auxiliary Heater Overheat Sensor Circuit Open

B2459 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B2459 Possible Causes

Faulty Auxiliary Heater Overheat Sensor,Auxiliary Heater Overheat Sensor harness is open or shorted,Auxiliary Heater Overheat Sensor circuit poor electrical connection

B2459 Description

The Powertrain Control Module (PCM) monitors the Auxiliary Heater Overheat Sensor. The PCM sets the OBDII code when the Auxiliary Heater Overheat Sensor is not to factory specifications.