B048E CHEVROLET – Auxiliary Heater System Malfunction

 

B048E CHEVROLET Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B048E CHEVROLET Possible Causes

 

Faulty Electrical Auxiliary Heater,Electrical Auxiliary Heater harness is open or shorted,Electrical Auxiliary Heater circuit poor electrical connection,Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

 

B048E CHEVROLET Description

 

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module sends a Pulse Width Modulation (PWM) signal to the electrical auxiliary heater, if the interior temperature is too low and additional heat is requested. The request signal from the HVAC control module, battery positive, ignition and ground circuits enable the electrical auxiliary heater to operate. Through the signal circuit the electrical auxiliary heater sends via a PWM signal the current status to the HVAC control module.