AutoCodes – Generic – B0248

B0248 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 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 8,157

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

What does this mean?

What are the Possible Causes of the DTC B0248?

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?

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 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 code?

Need more information on how to fix the B0248 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0248 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0248 Buick — Air Flow Control 3 Circuit
B0248 Cadillac — Air Flow Control 3 Circuit
B0248 Chevrolet — Air Flow Control 3 Circuit
B0248 GMC — Air Flow Control 3 Circuit
B0248 Pontiac — Air Flow Control 3 Circuit
B0248 Saturn — Air Flow Control 3 Circuit

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 Code

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

- Common symptoms include rough idling, poor acceleration, decreased fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code B0248?

- The code B0248 can be triggered by issues such as a faulty air flow control module, damaged wiring or connectors, or a malfunctioning air flow sensor.

3. How can I diagnose OBDII code B0248?

- Diagnosing code B0248 involves using a scan tool to read the code, checking the air flow control system components for any visible damage, and testing the electrical connections.

4. How can I repair OBDII code B0248?

- Repairing code B0248 may involve replacing the faulty air flow control module, repairing or replacing damaged wiring or connectors, or cleaning/replacing the air flow sensor.

5. Can I drive my vehicle with OBDII code B0248?

- It is not recommended to drive the vehicle with code B0248 as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

6. Are there any DIY tips for fixing OBDII code B0248?

- While some simple checks like inspecting the wiring connections can be done by DIY enthusiasts, it is recommended to seek professional help for diagnosing and repairing this code.

7. Will resetting the OBDII code B0248 make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue causing the code is not fixed, it is likely to return.

8. How much does it cost to repair OBDII code B0248?

- The cost of repairing code B0248 can vary depending on the root cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed.

9. Can a bad air filter cause OBDII code B0248?

- While a severely clogged air filter can affect air flow, it is unlikely to directly trigger OBDII code B0248. The code is usually related to specific components within the air flow control system.

10. Is it necessary to visit a dealership for OBDII code B0248 repairs?

- While dealerships are equipped to handle OBDII codes, independent auto repair shops and skilled mechanics can also effectively diagnose and repair code B0248.