Engine-Codes - Cadillac - B048D Cadillac

B048D Cadillac Code - Auxiliary Heater Temperature Command Circuit

- Code Popularity: 687 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC B048D Cadillac?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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

Code Tech Notes

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

⚠ Does your Cadillac have Safety Recalls? → Check here

How to Fix the DTC B048D Cadillac?

Check 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 pins.

Search for B048D Cadillac Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B048D Cadillac code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the B048D Cadillac Code Mean?

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module sends a low side pulse width modulation (PWM) signal to request electrical auxiliary heater operation if the interior temperature is too low and additional heat is required. The requested signal from the HVAC control module, battery positive, ignition, and ground circuits enable the electrical auxiliary heater to operate. The electrical auxiliary heater sends a ground signal to report the status of the heater operation. The Diagnostic Trouble Code (DTC) will be set when the feedback signal of the electrical auxiliary heater does not correspond with the requested PWM signal.

B048D Cadillac Code - Auxiliary Heater Temperature Command Circuit

Need more Information on the Code?

Need more information on how to fix the B048D Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B048D Cadillac code diagnosed by a professional: Find a repair shop in your area