AutoCodes – Chevrolet – B048E Chevrolet

B048E Chevrolet Code - Auxiliary Heater System Malfunction

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: B048E Chevrolet indicates Auxiliary Heater System Malfunction.
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 3,891

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 B048E 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 B048E Chevrolet - Auxiliary Heater System Malfunction - AutoCodes.com — B048E Chevrolet Code - Auxiliary Heater System Malfunction

What does this mean?

What are the Possible Causes of the DTC B048E 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 B048E 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

B048E:01 Auxiliary Heater System Malfunction Short to Battery
B048E:06 Auxiliary Heater System Malfunction Low Voltage/Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B048E 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 B048E Chevrolet code?

Need more information on how to fix the B048E Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B048E Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B048E 2014 Chevrolet Silverado — Auxiliary Heater System Malfunction
B048E 2015 Chevrolet Silverado — Auxiliary Heater System Malfunction
B048E 2016 Chevrolet Silverado — Auxiliary Heater System Malfunction
B048E 2017 Chevrolet Silverado — Auxiliary Heater System Malfunction
B048E 2018 Chevrolet Silverado — Auxiliary Heater System Malfunction

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 B048E Chevrolet Code

1. What are the common symptoms of OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction?

The common symptoms include the heater not functioning properly, insufficient heat output, or the heater not turning on at all.

2. What are the possible causes of OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction?

Possible causes include a faulty auxiliary heater element, a malfunctioning heater control module, wiring issues, or a blown fuse.

3. How can I diagnose the OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction?

Diagnosis involves checking the auxiliary heater element for continuity, inspecting the wiring for any damage, testing the heater control module, and verifying the fuse related to the auxiliary heater system.

4. What are some repair tips for resolving OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction?

Repair tips include replacing the faulty auxiliary heater element, repairing any damaged wiring, resetting the heater control module, and ensuring the fuse is in good condition.

5. Can I continue driving my Chevrolet with OBDII code B048E related to the Auxiliary Heater System Malfunction?

It is not recommended to continue driving the vehicle with this code present, as it can lead to discomfort from lack of heat in the cabin or potential further damage to the auxiliary heater system.

6. How much does it typically cost to repair OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction?

The cost of repair can vary depending on the specific issue, but it may range from $100 to $500, including parts and labor.

7. Is OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction a common issue?

While it may not be as common as other OBDII codes, issues with the auxiliary heater system can occur in Chevrolet vehicles, especially in colder climates.

8. Can I reset the OBDII code B048E related to the Auxiliary Heater System Malfunction on my Chevrolet by disconnecting the battery?

While disconnecting the battery may clear the code temporarily, it is recommended to diagnose and repair the underlying issue to prevent the code from reoccurring.

9. Will OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction cause the check engine light to illuminate?

Yes, this code can trigger the check engine light to illuminate on the dashboard, indicating a malfunction in the auxiliary heater system.

10. How long does it typically take to repair OBDII code B048E in a Chevrolet related to the Auxiliary Heater System Malfunction?

The repair time can vary depending on the specific issue and the expertise of the technician, but it may take anywhere from 1 to 4 hours to diagnose and resolve the problem.