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Engine-Codes - Generic - B048D

B048D - Auxiliary Heater Temperature Command Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B048D Possible Causes

What does this mean?
  • 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

How is the B048D code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

What does this mean?
DTC B048D 01: Auxiliary Heater Temperature Command Circuit Short to Battery
DTC B048D 06: Auxiliary Heater Temperature Command Circuit Low Voltage/Open

What is the cost to diagnose the B048D code

Labor: 1.0

The cost to diagnose the B048D 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.
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Possible Symptoms

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

B048D 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.

More Information

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