B0168 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B0168 – Passenger Compartment Temperature Sensor 2 Circuit

 

B0168 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B0168 Possible Causes

 

Faulty Passenger Compartment Temperature Sensor 2,Passenger Compartment Temperature Sensor 2 harness is open or shorted,Passenger Compartment Temperature Sensor 2 circuit poor electrical connection,Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

 

B0168 Description

 

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The module provides ground to the air temperature sensors through the low reference circuit. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. When the duct air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the duct air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module converts the voltage values to count values where 1 volt is approximately equal to 51 counts.