B048D GMC - Auxiliary Heater Temperature Command Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

B048D GMC 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

B048D GMC Tech Notes

DTC B048D 01: Auxiliary Heater Temperature Command Circuit Short to Battery
DTC B048D 06: Auxiliary Heater Temperature Command Circuit Low Voltage/Open

Cost of diagnosing the B048D GMC code

    Labor: 1.0

    The cost of diagnosing the B048D GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

B048D GMC Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B048D GMC Meaning

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.
OBDII Code B048D GMC - Auxiliary Heater Temperature Command Circuit - Engine-Codes.com

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