AutoCodes – Chevrolet – B374A 2015 Chevrolet Silverado

B374A 2015 Chevrolet Silverado Code - Air Flow Control Position Feedback Circuit

Quick Answer

Doors in the Heating, Ventilation, and Air Conditioning (HVAC) case assembly are used to control airflow. Common causes include Faulty Mode Actuator, Mode Actuator harness is open or shorted, Mode Actuator circuit poor electrical connection. 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 Chevrolet Silverado indicates Air Flow Control Position Feedback Circuit.
Common causes: Common causes include Faulty Mode Actuator, Mode Actuator harness is open or shorted, Mode Actuator circuit poor electrical connection.
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.

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Code Popularity 1,355

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B374A 2015 Chevrolet Silverado Description

Doors in the Heating, Ventilation, and Air Conditioning (HVAC) case assembly are used to control airflow. The HVAC control module operates the doors using actuators, with one actuator being used for each door. The system has the following air control doors and associated actuators: mode, left and right temperature, and recirculation. When equipped with auxiliary HVAC controls 2 additional actuators are added for auxiliary (rear) mode and temperature.
Each actuator used in the system is a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. The five circuits are low reference, 5 V reference, actuator position signal, and two control circuits. The control circuits use either ground or 12 V value to coordinate the actuator movement. In order to move the actuator, the HVAC control module grounds one of the control circuits while providing the other with 12 V. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction.
When the actuator shaft rotates, the potentiometer's sliding contact changes the door position signal between 0-5 V. The HVAC control module converts the voltage signal to counts. The total range of the counts is 0-1024, with an operating range between 20-1000. The actual operating range of an actuator is determined during calibration. During calibration, the actuator is moved through its full range of travel, and the module stores the minimum and maximum value. Based on the desired system operation, the module sets a commanded, or targeted, value for the actuators. The control circuits are operated to move the door to the required position, and the changing position signal is sent to the module. Once the actual position signal and the commanded value are the same, the module ceases operating the control circuits and the actuator (and door) remains in the desired position.

OBDII Code B374A 2015 Chevrolet Silverado - Air Flow Control Position Feedback Circuit - AutoCodes.com — B374A 2015 Chevrolet Silverado Code - Air Flow Control Position Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC B374A 2015 Chevrolet Silverado?

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 B374A 2015 Chevrolet Silverado?

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 B374A 2015 Chevrolet Silverado 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 B374A 2015 Chevrolet Silverado code?

Need more information on how to fix the B374A 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B374A 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Silverado Code

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

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

2. What are the possible causes of OBDII code B374A in a 2015 Chevrolet Silverado?

- Possible causes may include a faulty air flow sensor, issues with the air flow control position feedback circuit wiring, or a malfunctioning electronic control module (ECM).

3. How can I diagnose the Air Flow Control Position Feedback Circuit issue causing OBDII code B374A in my 2015 Chevrolet Silverado?

- You can start by inspecting the wiring harness for any visible damage or loose connections. Additionally, using a multimeter to test the air flow sensor and related components can help pinpoint the issue.

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

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the engine or emissions system. It's best to address the issue promptly.

5. Can a DIY enthusiast repair OBDII code B374A in a 2015 Chevrolet Silverado themselves?

- Depending on the DIYer's skill level and access to tools, some may be able to address the issue by checking and repairing wiring connections or replacing the air flow sensor. However, complex issues may require professional assistance.

6. How much does it typically cost to repair OBDII code B374A in a 2015 Chevrolet Silverado at a mechanic or dealership?

- The cost of repair can vary depending on the exact cause of the issue and labor rates in your area. Generally, it can range from $100 to $500 or more.

7. Will resetting the OBDII code B374A in my 2015 Chevrolet Silverado make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It's important to diagnose and fix the root cause of the problem.

8. Can a faulty air filter cause OBDII code B374A in a 2015 Chevrolet Silverado?

- While a dirty or clogged air filter can impact engine performance, it is not a common cause of this specific OBDII code related to the Air Flow Control Position Feedback Circuit.

9. How long does it typically take to repair OBDII code B374A in a 2015 Chevrolet Silverado?

- The repair time can vary based on the exact cause of the issue and the availability of parts. Simple fixes like replacing a sensor may take an hour or two, while more complex wiring issues could take longer.

10. Are there any preventive maintenance steps I can take to avoid OBDII code B374A in my 2015 Chevrolet Silverado?

- Regularly inspecting and maintaining the air flow sensor, checking the wiring connections, and keeping up with scheduled vehicle maintenance can help prevent issues that may trigger this OBDII code.