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B374A 2018 Chevrolet Silverado Code - Air Flow Control Position Feedback Circuit

Quick Answer

The B374A diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado relates 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 2018 Chevrolet Silverado 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 16, 2024
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Code B374A 2018 Chevrolet Silverado Description

The B374A diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado relates to the Air Flow Control Position Feedback Circuit. This code indicates a problem with the feedback circuit 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 regulating the amount of air that enters the cabin, ensuring proper ventilation, heating, and cooling.

OBDII Code B374A 2018 Chevrolet Silverado - Air Flow Control Position Feedback Circuit
B374A 2018 Chevrolet Silverado Code - Air Flow Control Position Feedback Circuit

Common Causes of B374A 2018 Chevrolet Silverado

  1. Faulty air flow control position sensor
  2. Wiring or connector issues in the feedback circuit
  3. Malfunctioning HVAC control module
  4. Blown fuse related to the air flow control system
  5. Internal fault within the HVAC system components

Symptoms of B374A 2018 Chevrolet Silverado

  1. Inconsistent air flow from the vents
  2. Unresponsive or erratic changes in temperature settings
  3. Unusual noises coming from the HVAC system
  4. HVAC system not responding to control inputs
  5. Reduced overall efficiency of the HVAC system

How to Fix B374A 2018 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the air flow control position sensor and its wiring connections.
  2. Test the HVAC control module for any faults or malfunctions using a diagnostic scanner.
  3. Check the fuse related to the air flow control system and replace if necessary.
  4. If no visible issues are found, consider replacing the air flow control position sensor or the HVAC control module.
  5. After completing the repairs, clear the DTC and test the HVAC system to ensure proper functionality.

Cost to Fix B374A 2018 Chevrolet Silverado

The typical repair costs for addressing the B374A DTC on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of parts such as the air flow control position sensor or HVAC control module can range from $50 to $300. Labor costs at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost for this issue could range from $150 to $600 or more, depending on the extent of the repairs needed. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific diagnosis and repair requirements for your vehicle.

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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 Chevrolet Silverado Code

1. What are common symptoms of OBDII code B374A in a 2018 Chevrolet Silverado?

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

2. What causes the OBDII code B374A in a 2018 Chevrolet Silverado?

- The B374A code typically indicates a fault in the air flow control position feedback circuit, which could be caused by a faulty sensor, wiring issue, or a problem with the control module.

3. How can I diagnose the issue related to OBDII code B374A in my 2018 Chevrolet Silverado?

- To diagnose the issue, you can use an OBDII scanner to read the trouble codes and then perform a visual inspection of the wiring and sensor connections. Testing the sensor and related components may also be necessary.

4. Is it safe to continue driving with OBDII code B374A in my 2018 Chevrolet Silverado?

- It is not recommended to continue driving with the B374A code present, as it can lead to further damage to the engine or components. It's best to address the issue promptly.

5. How can I repair the air flow control position feedback circuit issue causing OBDII code B374A in my 2018 Chevrolet Silverado?

- Repairing the issue may involve replacing the faulty sensor, repairing any damaged wiring, or reprogramming the control module. It's recommended to consult a professional mechanic for proper diagnosis and repair.

6. Can a DIY enthusiast fix the OBDII code B374A in a 2018 Chevrolet Silverado?

- While some DIY enthusiasts may be able to address simple wiring issues or replace sensors, diagnosing and repairing the root cause of the B374A code may require specialized tools and expertise, so professional assistance is often recommended.

7. What is the typical cost to repair OBDII code B374A in a 2018 Chevrolet Silverado?

- The cost of repairing the B374A code can vary depending on the specific cause of the issue and the labor rates in your area. It's advisable to get estimates from multiple mechanics before proceeding with repairs.

8. Will resetting the OBDII code B374A in my 2018 Chevrolet Silverado make it go away permanently?

- Simply resetting the code may temporarily clear the check engine light, but if the underlying issue causing the B374A code is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the problem.

9. How long does it typically take to repair OBDII code B374A in a 2018 Chevrolet Silverado?

- The repair time for the B374A code can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a full day to diagnose and fix the problem.

10. Can extreme weather conditions affect the occurrence of OBDII code B374A in a 2018 Chevrolet Silverado?

- Extreme weather conditions, such as extreme heat or cold, can potentially affect the performance of sensors and components related to the air flow control system, which could contribute to the occurrence of the B374A code.

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