AutoCodes – Chevrolet – B048D Chevrolet

B048D Chevrolet 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 Chevrolet 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 7,900

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 Chevrolet 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 Chevrolet - Auxiliary Heater Temperature Command Circuit - AutoCodes.com — B048D Chevrolet Code - Auxiliary Heater Temperature Command Circuit

What does this mean?

What are the Possible Causes of the DTC B048D Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

B048D 2014 Chevrolet Silverado — Auxiliary Heater Temperature Command Circuit
B048D 2015 Chevrolet Silverado — Auxiliary Heater Temperature Command Circuit
B048D 2016 Chevrolet Silverado — Auxiliary Heater Temperature Command Circuit
B048D 2017 Chevrolet Silverado — Auxiliary Heater Temperature Command Circuit
B048D 2018 Chevrolet Silverado — Auxiliary Heater Temperature Command Circuit

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 Chevrolet Code

1. What are the common symptoms of OBDII code B048D for Chevrolet's Auxiliary Heater Temperature Command Circuit?

The common symptoms include a lack of heat coming from the heater, inconsistent temperature control, or the heater not functioning at all.

2. What are the possible causes of OBDII code B048D related to the Auxiliary Heater Temperature Command Circuit in a Chevrolet?

Possible causes include a faulty temperature control module, damaged wiring or connectors, a malfunctioning auxiliary heater control module, or a problem with the heater core.

3. How can I diagnose the issue causing OBDII code B048D in my Chevrolet related to the Auxiliary Heater Temperature Command Circuit?

You can diagnose the issue by conducting a thorough inspection of the wiring and connectors, testing the temperature control module and auxiliary heater control module, and checking the heater core for any issues.

4. Can I still drive my Chevrolet with OBDII code B048D related to the Auxiliary Heater Temperature Command Circuit?

It is not recommended to drive your vehicle with this code unresolved, as it may lead to discomfort due to lack of heat in the cabin or potential further damage to the heating system.

5. How can I repair OBDII code B048D for Chevrolet's Auxiliary Heater Temperature Command Circuit?

Repair options may include replacing the temperature control module, repairing or replacing damaged wiring and connectors, replacing the auxiliary heater control module, or addressing any issues with the heater core.

6. Is it safe to continue using the heater in my Chevrolet if OBDII code B048D is present?

It is advisable to avoid using the heater until the issue causing the code is properly diagnosed and repaired to prevent any potential overheating or further damage to the system.

7. Will resetting the OBDII code B048D in my Chevrolet fix the issue related to the Auxiliary Heater Temperature Command Circuit?

Resetting the code may temporarily clear the error message, but it will not fix the underlying issue causing the code to appear. Proper diagnosis and repair are necessary to address the problem.

8. How much does it typically cost to repair OBDII code B048D for Chevrolet's Auxiliary Heater Temperature Command Circuit?

The cost of repair can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It is recommended to consult a professional mechanic for an accurate estimate.

9. Can extreme weather conditions affect the occurrence of OBDII code B048D related to the Auxiliary Heater Temperature Command Circuit in a Chevrolet?

Extreme cold weather conditions can potentially exacerbate issues with the auxiliary heater system, leading to the occurrence of this code. It is important to address any heating system problems promptly, especially in cold climates.

10. How can regular maintenance help prevent OBDII code B048D related to the Auxiliary Heater Temperature Command Circuit in a Chevrolet?

Regular maintenance, including checking the heating system components, inspecting wiring and connectors, and addressing any issues promptly, can help prevent the occurrence of this OBDII code and ensure optimal performance of the auxiliary heater system.