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B374A 2018 GMC Sierra Code - Air Flow Control Position Feedback Circuit

Quick Answer

The B374A diagnostic trouble code (DTC) on a 2018 GMC Sierra relates to the Air Flow Control Position Feedback Circuit. Common causes include Faulty air flow control position sensor, Wiring issues in the air flow control position feedback circuit, Blown fuse related to the HVAC system. 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 2018 GMC Sierra indicates Air Flow Control Position Feedback Circuit.
Common causes
Common causes include Faulty air flow control position sensor, Wiring issues in the air flow control position feedback circuit, Blown fuse related to the HVAC system.
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 11, 2024
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Code B374A 2018 GMC Sierra Description

The B374A diagnostic trouble code (DTC) on a 2018 GMC Sierra relates to the Air Flow Control Position Feedback Circuit. This code indicates that there is a problem with the circuit responsible for providing feedback on the position of the air flow control within the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. The air flow control position feedback circuit plays a crucial role in regulating the flow and direction of air within the vehicle, ensuring that the desired temperature and air distribution settings are maintained.

OBDII Code B374A 2018 GMC Sierra - Air Flow Control Position Feedback Circuit
B374A 2018 GMC Sierra Code - Air Flow Control Position Feedback Circuit

Common Causes of B374A 2018 GMC Sierra

  1. Faulty air flow control position sensor
  2. Wiring issues in the air flow control position feedback circuit
  3. Blown fuse related to the HVAC system
  4. Malfunctioning HVAC control module

Symptoms of B374A 2018 GMC Sierra

  1. Inconsistent temperature output from the HVAC system
  2. Unresponsive climate control settings
  3. Inability to control airflow direction
  4. HVAC system failure

How to Fix B374A 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the air flow control position sensor and the associated wiring. Look for any signs of damage or corrosion that may be affecting the circuit's functionality.
  2. Test the air flow control position sensor using a multimeter to determine if it is sending accurate feedback signals to the HVAC control module.
  3. Check the fuse related to the HVAC system to ensure it is intact and functioning correctly. Replace any blown fuses as needed.
  4. If the sensor and wiring appear to be in good condition, the issue may lie with the HVAC control module. Consider replacing the module to address the fault in the air flow control position feedback circuit.

Cost to Fix B374A 2018 GMC Sierra

The typical repair costs for addressing the B374A code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty air flow control position sensor or repairing wiring issues may cost between $200 and $500, including parts and labor. If the HVAC control module needs to be replaced, the repair costs can range from $500 to $1000 or more. It is important to note that these estimates are approximate, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops. Be sure to consult with a qualified technician to get an accurate cost estimate for repairing this issue.

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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 2018 GMC Sierra Code

1. What are common symptoms of OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

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

2. What are some possible causes of OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Potential causes could be a faulty air flow sensor, wiring issues, a vacuum leak, or a malfunctioning electronic control module (ECM).

3. How can I diagnose OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the air flow sensor and its wiring, checking for vacuum leaks, and testing the ECM.

4. Can I continue driving my 2018 GMC Sierra with OBDII code B374A related to the Air Flow Control Position Feedback Circuit?

- It is not recommended to drive with this code present, as it can lead to further damage and potentially unsafe driving conditions.

5. How can I repair OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Repair methods may include replacing the air flow sensor, repairing or replacing damaged wiring, fixing any vacuum leaks, or reprogramming the ECM.

6. Will resetting the OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit solve the issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the code to trigger.

7. Is it possible to prevent OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Regular maintenance, such as keeping the air filter clean and checking for vacuum leaks, can help prevent issues that may trigger this code.

8. Can a DIY enthusiast repair OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Depending on the individual's skill level, some repairs related to this code can be done at home, but more complex issues may require professional assistance.

9. Are there any recalls or service bulletins related to OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- It is advisable to check with your local GMC dealership or visit the manufacturer's website to see if there are any relevant recalls or service bulletins regarding this code.

10. How much can I expect to pay to repair OBDII code B374A in a 2018 GMC Sierra related to the Air Flow Control Position Feedback Circuit?

- Repair costs can vary depending on the specific issue causing the code, but it is recommended to obtain a diagnostic from a qualified mechanic to determine the exact cost.

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