AutoCodes – Buick – B0249 Buick

B0249 Buick 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 Buick 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 1,846

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

What does this mean?

What are the Possible Causes of the DTC B0249 Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What are the common symptoms of OBDII code B0249 in a Buick related to the Air Flow Control 3 Circuit Range?

The common symptoms include rough idling, poor engine performance, decreased fuel efficiency, and potential stalling.

2. What are the possible causes of OBDII code B0249 Buick related to the Air Flow Control 3 Circuit Range?

Potential causes include a faulty air flow control actuator, wiring issues, a malfunctioning control module, or a problem with the air intake system.

3. How can I diagnose the OBDII code B0249 in my Buick?

Diagnosis typically involves using a scan tool to retrieve the trouble code, inspecting the air flow control components, checking the wiring for any damage, and testing the control module for proper functionality.

4. Can I drive my Buick with an active OBDII code B0249 related to the Air Flow Control 3 Circuit Range?

It is not recommended to drive your vehicle with this code active, as it can lead to poor engine performance and potential issues that may affect safety and drivability.

5. How much does it cost to repair OBDII code B0249 in a Buick?

The cost of repair can vary depending on the exact cause of the code, but it may involve replacing the air flow control actuator, repairing wiring issues, or reprogramming the control module. Costs can range from a few hundred to over a thousand dollars.

6. Are there any DIY repair tips for OBDII code B0249 Buick related to the Air Flow Control 3 Circuit Range?

DIY enthusiasts with automotive repair experience may attempt to inspect and clean the air flow control components, check for loose or damaged wiring, and reset the control module to see if the code clears.

7. How urgent is it to address OBDII code B0249 Buick related to the Air Flow Control 3 Circuit Range?

While the severity may vary depending on the exact cause, it is generally recommended to address this code promptly to prevent potential engine damage and ensure optimal vehicle performance.

8. Can a mechanic reset the OBDII code B0249 without repairing the underlying issue in a Buick?

Resetting the code without addressing the root cause is not a recommended practice, as the issue will likely reoccur and may lead to further problems down the line.

9. Will OBDII code B0249 Buick clear on its own over time?

In some cases, if the underlying issue is minor and self-corrects, the code may clear on its own after several successful drive cycles. However, it is best to diagnose and address the problem promptly.

10. Is it possible for a loose gas cap to trigger OBDII code B0249 Buick related to the Air Flow Control 3 Circuit Range?

While a loose gas cap typically triggers a different code related to the evaporative emissions system, it is still important to ensure the gas cap is properly tightened to rule out any potential contributing factors to the issue.