AutoCodes – Generic – B0249

B0249 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 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 1,930

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

What does this mean?

What are the Possible Causes of the DTC B0249?

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?

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 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 code?

Need more information on how to fix the B0249 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0249 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0249 Buick — Air Flow Control 3 Circuit Range
B0249 Cadillac — Air Flow Control 3 Circuit Range
B0249 Chevrolet — Air Flow Control 3 Circuit Range
B0249 GMC — Air Flow Control 3 Circuit Range
B0249 Pontiac — Air Flow Control 3 Circuit Range
B0249 Saturn — Air Flow Control 3 Circuit Range

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 Code

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

Possible symptoms include poor engine performance, rough idling, stalling, and illuminated Check Engine Light.

2. What are the typical causes of OBDII code B0249?

Common causes of this code include faulty air flow control sensor, wiring issues, and a malfunctioning control module.

3. How can I diagnose the source of OBDII code B0249?

Diagnosing this code typically involves using a scan tool to retrieve the code, testing the air flow control sensor, inspecting the wiring for damage, and checking the control module.

4. Can a dirty air filter trigger OBDII code B0249?

A dirty air filter is not a direct cause of this code, but a restricted air filter can lead to airflow issues that may contribute to triggering the code.

5. Is it safe to drive with OBDII code B0249 active?

It is not recommended to drive with this code active, as it can lead to poor engine performance and potential stalling, which can be unsafe.

6. How can I reset OBDII code B0249 after making repairs?

After repairing the underlying issue causing the code, you can reset it using an OBDII scan tool or by disconnecting the vehicle's battery for a few minutes.

7. Can I repair OBDII code B0249 myself?

Repairing this code may require basic automotive knowledge and tools. If you are comfortable working on your vehicle, you can attempt the repairs; otherwise, it's best to seek professional help.

8. What are some preventive maintenance tips to avoid OBDII code B0249?

Regularly inspecting and cleaning the air flow control sensor, checking the wiring for damage, and replacing the air filter as recommended can help prevent this code.

9. Will OBDII code B0249 cause permanent damage to my vehicle if not addressed promptly?

Ignoring this code can lead to decreased fuel efficiency, engine performance issues, and potential damage to other components over time if left unresolved.

10. How much can I expect to pay for repairs related to OBDII code B0249?

The cost of repairs for this code can vary depending on the underlying issue, the labor rates in your area, and whether you choose to do the repairs yourself or seek professional help.