AutoCodes – GMC – B0248 GMC

B0248 GMC Code - Air Flow Control 3 Circuit

Quick Answer

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. Common causes include Faulty Mode Actuator, Mode Actuator harness is open or shorted, Mode Actuator 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: B0248 GMC indicates Air Flow Control 3 Circuit.
Common causes: Common causes include Faulty Mode Actuator, Mode Actuator harness is open or shorted, Mode Actuator 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 5,709

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 Mar 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0248 GMC Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. With the switches and dials on the HVAC controls, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module via serial data. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors move the appropriate doors into the calculated positions, in order to reach the desired positions.

OBDII Code B0248 GMC - Air Flow Control 3 Circuit - AutoCodes.com — B0248 GMC Code - Air Flow Control 3 Circuit

What does this mean?

What are the Possible Causes of the DTC B0248 GMC?

Faulty Mode Actuator
Mode Actuator harness is open or shorted
Mode Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0248 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0248 GMC 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 B0248 GMC code?

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Need Help with the 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 B0248 GMC Code

1. What are the common symptoms of OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

The common symptoms of this code may include issues with the air flow control system, such as reduced engine performance, poor fuel economy, and possible stalling.

2. What are some possible causes of OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

Possible causes of this code can include a faulty air flow control actuator, damaged wiring or connectors in the air flow control circuit, or a malfunctioning control module.

3. How can I diagnose OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

Diagnosing this code typically involves using a scan tool to retrieve the code and then performing a visual inspection of the air flow control system components, checking for loose connections or damaged wiring.

4. Can I drive my vehicle with OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

It is not recommended to drive your vehicle with this code present, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

5. How can I repair OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

Repairing this code may involve replacing the faulty air flow control actuator, repairing or replacing damaged wiring or connectors, or reprogramming the control module, depending on the specific cause.

6. Will OBDII code B0248 GMC (Air Flow Control 3 Circuit) cause my check engine light to come on?

Yes, this code will trigger the check engine light to illuminate on your dashboard, indicating a problem with the air flow control system that needs to be addressed.

7. How much does it typically cost to repair OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

The cost of repairing this code can vary depending on the specific cause and the labor rates in your area, but it may range from $100 to $500 or more, including parts and labor.

8. Can a DIY enthusiast fix OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address this code by following repair guides and using diagnostic equipment to pinpoint the issue.

9. How urgent is it to address OBDII code B0248 GMC (Air Flow Control 3 Circuit)?

While your vehicle may still be operable with this code present, it's important to address it promptly to prevent further damage and ensure optimal performance and fuel efficiency.

10. Is OBDII code B0248 GMC (Air Flow Control 3 Circuit) a common issue in GMC vehicles?

This code can occur in various GMC models, especially those equipped with air flow control systems, and is a relatively common issue that can be resolved with proper diagnosis and repair.