B048D 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
First diagnose B048D code
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 terminals.
B048D Tech NotesDTC 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 code
Labor: 1.0The cost of diagnosing 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.
B048D Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B048D MeaningThe 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.
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