AutoCodes – GMC – B048D 2016 GMC Sierra

B048D 2016 GMC Sierra Code - Auxiliary Heater Temperature Command Circuit

Quick Answer

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. Common causes include Faulty Electrical Auxiliary Heater, Electrical Auxiliary Heater harness is open or shorted, Electrical Auxiliary Heater circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B048D 2016 GMC Sierra indicates Auxiliary Heater Temperature Command Circuit.
Common causes: Common causes include Faulty Electrical Auxiliary Heater, Electrical Auxiliary Heater harness is open or shorted, Electrical Auxiliary Heater circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 213

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 12, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B048D 2016 GMC Sierra Description

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.

OBDII Code B048D 2016 GMC Sierra - Auxiliary Heater Temperature Command Circuit - AutoCodes.com — B048D 2016 GMC Sierra Code - Auxiliary Heater Temperature Command Circuit

What does this mean?

What are the Possible Causes of the DTC B048D 2016 GMC Sierra?

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 to Fix the DTC B048D 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B048D 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B048D 2016 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B048D 2016 GMC Sierra Code

What does the OBDII code B048D mean for a 2016 GMC Sierra?

B048D indicates a problem with the Auxiliary Heater Temperature Command Circuit, which may affect the operation of the auxiliary heater system.

What symptoms might I notice with the B048D code?

Common symptoms include the auxiliary heater not functioning properly, reduced cabin heating, or the heater not turning on at all.

What are some common causes of the B048D code?

Potential causes include a faulty auxiliary heater control module, damaged wiring, poor connections, or a malfunctioning temperature sensor.

How can I diagnose the B048D code effectively?

Begin by using an OBDII scanner to confirm the code. Inspect the wiring and connectors for damage, check the auxiliary heater control module, and test the temperature sensor for proper operation.

Is it safe to drive my GMC Sierra with the B048D code?

While it may be safe to drive, the lack of proper heating could lead to discomfort in cold weather. Itâ€™s advisable to address the issue to restore the auxiliary heating function.

What repairs might be necessary for the B048D code?

Repairs may include replacing the auxiliary heater control module, fixing any damaged wiring, or replacing a faulty temperature sensor.

Can I reset the code B048D after repairs?

Yes, after addressing the underlying issue, you can use an OBDII scanner to clear the code. Ensure the problem is resolved to prevent the code from returning.

Are there any DIY fixes I can try for the B048D code?

You can start with visual inspections of the wiring and connectors, ensuring there are no loose or corroded connections. If comfortable, you can also test the temperature sensor with a multimeter.

Will clearing the code fix the underlying issue?

No, clearing the code will not fix the underlying problem. Itâ€™s important to diagnose and repair the root cause to prevent the code from reappearing.