AutoCodes – Chevrolet – B374A 2016 Chevrolet Silverado

B374A 2016 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 2016 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 793

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 2016 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 2016 Chevrolet Silverado - Air Flow Control Position Feedback Circuit - AutoCodes.com — B374A 2016 Chevrolet Silverado Code - Air Flow Control Position Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC B374A 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the B374A 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B374A 2016 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 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B374A in a 2016 Chevrolet Silverado?

The common symptoms include poor engine performance, rough idling, reduced fuel efficiency, and possible stalling of the vehicle.

2. What causes the OBDII code B374A in a 2016 Chevrolet Silverado?

This code is typically triggered by issues with the air flow control position feedback circuit, such as a faulty sensor, wiring problems, or a malfunctioning control module.

3. How can I diagnose the OBDII code B374A in my 2016 Chevrolet Silverado?

Diagnosing this code usually involves conducting a thorough inspection of the air flow control system, checking the sensor readings, and using a diagnostic scanner to retrieve specific error codes.

4. Can I drive my 2016 Chevrolet Silverado with the OBDII code B374A?

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

5. How do I repair the OBDII code B374A in my 2016 Chevrolet Silverado?

Repairing this code may involve replacing the faulty air flow control sensor, repairing damaged wiring, or reprogramming the control module. It is advisable to seek professional help for accurate diagnosis and repair.

6. Are there any DIY tips for fixing the OBDII code B374A in a 2016 Chevrolet Silverado?

While some basic checks like inspecting the wiring connections can be done at home, complex repairs involving sensor replacement or module reprogramming are best left to experienced mechanics.

7. How much does it typically cost to repair the OBDII code B374A in a 2016 Chevrolet Silverado?

The repair costs for this code can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Will resetting the OBDII code B374A in my 2016 Chevrolet Silverado make it go away permanently?

Resetting the code without addressing the underlying issue will only temporarily clear the error. The problem will likely resurface unless the root cause is identified and fixed.

9. Can extreme weather conditions affect the triggering of the OBDII code B374A in a 2016 Chevrolet Silverado?

Yes, extreme temperatures or humidity levels can sometimes impact the air flow control system, potentially leading to the triggering of this code. It's essential to maintain your vehicle properly in such conditions.

10. Is the OBDII code B374A specific to the 2016 Chevrolet Silverado, or can it appear in other vehicles?

While this code is associated with the 2016 Chevrolet Silverado, similar issues related to the air flow control position feedback circuit can occur in other vehicles as well, albeit with different specific codes.