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Engine-Codes – GMC – B374A 2016 GMC Sierra

B374A 2016 GMC Sierra Code - Air Flow Control Position Feedback Circuit

Quick Answer

The B374A diagnostic trouble code (DTC) for a 2016 GMC Sierra pertains to the Air Flow Control Position Feedback Circuit. Common causes include Faulty air flow control position sensor, Wiring or connector issues in the feedback circuit, Malfunctioning HVAC control module. 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 2016 GMC Sierra indicates Air Flow Control Position Feedback Circuit.
Common causes
Common causes include Faulty air flow control position sensor, Wiring or connector issues in the feedback circuit, Malfunctioning HVAC control module.
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 12, 2024
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Code B374A 2016 GMC Sierra Description

The B374A diagnostic trouble code (DTC) for a 2016 GMC Sierra pertains to the Air Flow Control Position Feedback Circuit. This code indicates a problem with the feedback mechanism that controls the air flow within the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. The air flow control position feedback circuit is responsible for ensuring that the air flow within the cabin is adjusted according to the desired settings selected by the driver or passengers.

OBDII Code B374A 2016 GMC Sierra - Air Flow Control Position Feedback Circuit
B374A 2016 GMC Sierra Code - Air Flow Control Position Feedback Circuit

Common Causes of B374A 2016 GMC Sierra

  1. Faulty air flow control position sensor
  2. Wiring or connector issues in the feedback circuit
  3. Malfunctioning HVAC control module
  4. Problems with the air flow control actuators
  5. Electrical issues such as blown fuses or relays

Symptoms of B374A 2016 GMC Sierra

  1. Inconsistent air flow from the vents
  2. Inability to adjust the temperature or direction of the air
  3. HVAC system not responding to control inputs
  4. Unusual noises coming from the HVAC system

How to Fix B374A 2016 GMC Sierra

  1. Diagnose the specific cause of the issue using a scan tool to read the DTC and testing the components of the air flow control system.
  2. Replace any faulty components such as the air flow control position sensor, wiring harness, HVAC control module, or actuators.
  3. Ensure all electrical connections are secure and free from corrosion.
  4. Clear the DTC from the vehicle's computer system and test the HVAC system to verify proper operation.
  5. Perform a system reset to calibrate the air flow control position feedback circuit.

Cost to Fix B374A 2016 GMC Sierra

The cost of repairing the Air Flow Control Position Feedback Circuit issue can vary depending on the specific cause of the problem and the labor rates at the auto repair shop. In general, the parts required for this repair may range from $50 to $200, while the labor costs can be between $100 and $300. Overall, the total repair cost could range from $150 to $500. It's important to note that prices may vary based on location, vehicle make and model, and the severity of the issue. It's advisable to consult with a trusted mechanic or auto repair shop to get a more accurate estimate for your specific situation.

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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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B374A in a 2016 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 are the possible causes of OBDII code B374A in a 2016 GMC Sierra?

- Possible causes could be a faulty air flow sensor, damaged wiring or connectors in the air flow control circuit, or a malfunctioning electronic control module.

3. How can I diagnose the issue related to the Air Flow Control Position Feedback Circuit in a 2016 GMC Sierra?

- Diagnosing the issue may involve using an OBDII scanner to read the specific code, checking the air flow sensor for proper operation, and inspecting the wiring and connectors for any visible damage.

4. Can I continue driving my 2016 GMC Sierra with OBDII code B374A related to the Air Flow Control Position Feedback Circuit?

- It is not recommended to continue driving the vehicle with this code as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

5. How can I repair OBDII code B374A in my 2016 GMC Sierra myself?

- Repairing this code may involve replacing the faulty air flow sensor, repairing or replacing damaged wiring or connectors, or resetting the electronic control module. If you're unsure, it's best to consult a professional mechanic.

6. Will resetting the OBDII code B374A in a 2016 GMC Sierra fix the issue permanently?

- Resetting the code may temporarily clear the warning, but if the underlying issue causing the code is not addressed, it is likely to reappear. Proper diagnosis and repair are necessary for a permanent solution.

7. Is it safe to drive my 2016 GMC Sierra if the OBDII code B374A related to the Air Flow Control Position Feedback Circuit keeps coming back after repairs?

- If the code keeps reappearing after repairs, there may be an ongoing issue that needs further inspection. Continuing to drive the vehicle without addressing the root cause can lead to more serious problems.

8. Are there any preventative maintenance measures I can take to avoid OBDII code B374A in my 2016 GMC Sierra?

- Regularly inspecting and maintaining the air flow sensor, checking the wiring and connectors for any signs of wear or damage, and following the manufacturer's recommended maintenance schedule can help prevent this code from appearing.

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