B0337 GMC – Inside Temperature Sensor Short To Ground

B0337 GMC Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B0337 GMC Possible Causes

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

B0337 GMC Description

The ambient air temperature sensor allows the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the air surrounding the front of the vehicle. The inside air temperature sensor allows the HVAC control module to monitor the temperature of the air inside the passenger compartment. 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 circuits. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. The HVAC control module also uses the ambient air temperature input to calculate the value of the ambient air temperature display. When the air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the air temperatures are hot, the resistances of the sensors are low and the voltage signals are low.