AutoCodes – GMC – B0249 GMC

B0249 GMC Code - Air Flow Control 3 Circuit Range

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: B0249 GMC indicates Air Flow Control 3 Circuit Range.
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 895

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 B0249 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 B0249 GMC - Air Flow Control 3 Circuit Range - AutoCodes.com — B0249 GMC Code - Air Flow Control 3 Circuit Range

What does this mean?

What are the Possible Causes of the DTC B0249 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 B0249 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 B0249 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 B0249 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 B0249 GMC Code

1. What are the common symptoms of OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Common symptoms may include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What are the possible causes of OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Possible causes can include a faulty air flow control actuator, damaged wiring or connectors, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the issue related to OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Diagnosing the issue may involve using a scan tool to retrieve the trouble codes, inspecting the air flow control system components, and testing the electrical connections.

4. Can a dirty or faulty air filter trigger OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- While a dirty or faulty air filter may affect engine performance, it is not a direct cause of OBDII code B0249. However, it's still recommended to ensure the air filter is clean and properly installed.

5. What are some repair tips for resolving OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the air flow control actuator if necessary, and clearing the trouble codes after the repair is completed.

6. Is it safe to continue driving with OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- It is not recommended to continue driving with this code unresolved, as it can lead to further engine damage or issues. It's best to address the underlying problem as soon as possible.

7. Can resetting the PCM clear OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Resetting the PCM may temporarily clear the trouble code, but if the underlying issue is not resolved, the code is likely to reappear after some time.

8. How much does it typically cost to repair OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Repair costs can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to do the repairs yourself or take it to a professional mechanic.

9. Are there any preventative measures to avoid OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range in the future?

- Regular maintenance of the air flow control system, including checking for any signs of wear or damage, can help prevent issues that may trigger this trouble code.

10. Can a DIY enthusiast with basic mechanical skills attempt to fix OBDII code B0249 (GMC) - Air Flow Control 3 Circuit Range?

- Depending on the specific cause of the issue, some DIY enthusiasts with basic mechanical skills may be able to address the problem themselves, while others may require professional assistance. It's important to assess your own abilities and comfort level with automotive repairs before attempting to fix this code.