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B374A 2015 GMC Sierra Code - Air Flow Control Position Feedback Circuit

Quick Answer

The B374A diagnostic trouble code (DTC) in a 2015 GMC Sierra indicates a problem with the Air Flow Control Position Feedback Circuit. Common causes include Faulty air flow sensor, Malfunctioning throttle position sensor, Vacuum leak. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B374A 2015 GMC Sierra indicates Air Flow Control Position Feedback Circuit.
Common causes
Common causes include Faulty air flow sensor, Malfunctioning throttle position sensor, Vacuum leak.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B374A 2015 GMC Sierra Description

The B374A diagnostic trouble code (DTC) in a 2015 GMC Sierra indicates a problem with the Air Flow Control Position Feedback Circuit. This code is typically triggered when the vehicle's onboard computer detects an issue with the feedback circuit that controls the air flow within the engine. The air flow control position feedback circuit is crucial for maintaining the proper air-fuel mixture in the engine, which is essential for optimal performance and fuel efficiency.

OBDII Code B374A 2015 GMC Sierra - Air Flow Control Position Feedback Circuit
B374A 2015 GMC Sierra Code - Air Flow Control Position Feedback Circuit

Common Causes of B374A 2015 GMC Sierra

  1. Faulty air flow sensor
  2. Malfunctioning throttle position sensor
  3. Vacuum leak
  4. Wiring or connector issues in the air flow control system

Symptoms of B374A 2015 GMC Sierra

  1. Decreased engine power and acceleration
  2. Rough idling or stalling
  3. Poor fuel economy
  4. Increased emissions
  5. Lack of responsiveness while driving

How to Fix B374A 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the air flow control system to identify any visible damage or loose connections.
  2. Test the air flow sensor and throttle position sensor using a multimeter to determine if they are functioning correctly.
  3. Check for any vacuum leaks in the system and repair or replace any damaged hoses or components.
  4. Inspect the wiring and connectors in the air flow control system for any signs of corrosion or damage, and repair or replace as needed.
  5. Clear the DTC from the vehicle's computer using an OBD-II scanner after completing the repairs to reset the system and ensure the issue has been resolved.

Cost to Fix B374A 2015 GMC Sierra

The typical repair costs for addressing the B374A code in a 2015 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It is recommended to check local rates for a more accurate estimate.

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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 B374A 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

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

2. What could be causing the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Possible causes of this code may include a faulty air flow sensor, damaged wiring or connectors, or issues with the air flow control module.

3. How can I diagnose the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- To diagnose this code, you can use an OBDII scanner to retrieve the specific fault code, visually inspect the wiring and connectors, and test the air flow sensor for proper function.

4. Is it safe to continue driving my 2015 GMC Sierra with the OBDII code B374A related to the Air Flow Control Position Feedback Circuit?

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

5. Can I repair the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit myself?

- Depending on your skill level and access to tools, you may be able to address this code yourself by replacing the faulty sensor, repairing damaged wiring, or resetting the control module. However, professional help is recommended for accurate diagnosis and proper repair.

6. How much does it typically cost to repair the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- The cost of repair can vary based on the specific cause of the code. It may range from a simple sensor replacement costing around $100 to more complex repairs involving module replacement, which could cost several hundred dollars.

7. Will resetting the check engine light clear the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. How long does it take to repair the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- The repair time can vary depending on the complexity of the issue and the availability of parts. Simple repairs may take a few hours, while more involved repairs could require a day or more to complete.

9. Can extreme weather conditions affect the occurrence of the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Extreme weather conditions, such as high humidity or extreme temperatures, can potentially impact the performance of sensors and electrical components, which may contribute to triggering this fault code.

10. Is it necessary to perform a driving cycle after repairing the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Performing a driving cycle after repairing the fault code can help the vehicle's onboard computer system to relearn and recalibrate, ensuring that the issue has been successfully resolved.

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