B374A 2017 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 2017 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.
Code B374A 2017 Chevrolet Silverado Description
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.
What are the Possible Causes of the DTC B374A 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?
Need more information on how to fix the B374A 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals
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Frequently Asked Questions about B374A 2017 Chevrolet Silverado Code
1. What are common symptoms of OBDII code B374A in a 2017 Chevrolet Silverado?
The common symptoms of OBDII code B374A in a 2017 Chevrolet Silverado include engine misfires, rough idling, poor acceleration, and a decrease in fuel efficiency.
2. What does OBDII code B374A indicate in a 2017 Chevrolet Silverado?
OBDII code B374A in a 2017 Chevrolet Silverado indicates an issue with the Air Flow Control Position Feedback Circuit.
3. What are possible causes of OBDII code B374A in a 2017 Chevrolet Silverado?
Possible causes of OBDII code B374A in a 2017 Chevrolet Silverado include a faulty air flow sensor, damaged wiring or connectors in the circuit, or a malfunctioning control module.
4. How can I diagnose OBDII code B374A in my 2017 Chevrolet Silverado?
To diagnose OBDII code B374A in your 2017 Chevrolet Silverado, you can use an OBDII scanner to retrieve the code and then inspect the air flow sensor, wiring, and connectors for any visible damage.
5. Can I drive my 2017 Chevrolet Silverado with OBDII code B374A?
It is not recommended to drive your 2017 Chevrolet Silverado with OBDII code B374A, as it can lead to further damage to the engine and other components.
6. How can I repair OBDII code B374A in my 2017 Chevrolet Silverado?
To repair OBDII code B374A in your 2017 Chevrolet Silverado, you may need to replace the faulty air flow sensor, repair any damaged wiring or connectors, or reprogram the control module.
7. Is OBDII code B374A a serious issue in a 2017 Chevrolet Silverado?
OBDII code B374A should be addressed promptly in a 2017 Chevrolet Silverado to prevent potential engine performance issues and to ensure optimal fuel efficiency.
8. Can a DIY enthusiast fix OBDII code B374A in a 2017 Chevrolet Silverado?
A DIY enthusiast with the necessary tools and knowledge may be able to fix OBDII code B374A in a 2017 Chevrolet Silverado by following repair guides and procedures.
9. How much does it cost to repair OBDII code B374A in a 2017 Chevrolet Silverado?
The cost to repair OBDII code B374A in a 2017 Chevrolet Silverado can vary depending on the extent of the issue, the parts needed, and whether you perform the repair yourself or take it to a professional mechanic.
10. Are there any preventive measures to avoid OBDII code B374A in a 2017 Chevrolet Silverado?
Regular maintenance, including keeping the air flow sensor clean and checking the wiring for any signs of wear, can help prevent OBDII code B374A in a 2017 Chevrolet Silverado.
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