B374A 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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.
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Frequently Asked Questions about B374A 2014 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code B374A in a 2014 Chevrolet Silverado related to the Air Flow Control Position Feedback Circuit?
- Common symptoms include rough idling, reduced engine performance, and potential stalling.
2. What can cause the OBDII code B374A to trigger in a 2014 Chevrolet Silverado?
- Possible causes of this code include a faulty air flow control position sensor, damaged wiring or connectors, or issues with the engine control module.
3. How can I diagnose the cause of OBDII code B374A in my 2014 Chevrolet Silverado?
- Diagnostic steps may include checking the sensor's wiring and connectors for damage, testing the sensor's functionality, and confirming proper voltage and ground connections.
4. Is it safe to continue driving my 2014 Chevrolet Silverado with OBDII code B374A active?
- It is not recommended to drive with this code active, as it can lead to engine performance issues or potential damage if left unaddressed.
5. Can I reset OBDII code B374A in my 2014 Chevrolet Silverado without fixing the underlying issue?
- While you can clear the code with an OBDII scanner, it is important to address the root cause to prevent the issue from recurring.
6. Will replacing the air flow control position sensor fix OBDII code B374A in my 2014 Chevrolet Silverado?
- Replacing the sensor may resolve the issue, but it is recommended to perform a thorough diagnosis to ensure there are no underlying wiring or module problems.
7. How much does it typically cost to repair OBDII code B374A in a 2014 Chevrolet Silverado?
- Repair costs can vary depending on the specific issue, but they may range from around $100 for a sensor replacement to over $500 for more extensive repairs.
8. Can a DIY enthusiast fix OBDII code B374A in a 2014 Chevrolet Silverado?
- Depending on the skill level and tools available, some DIY enthusiasts may be able to address this code by replacing the sensor or checking wiring connections.
9. Are there any preventive measures to avoid OBDII code B374A in a 2014 Chevrolet Silverado?
- Regular maintenance, such as keeping the air filter clean and checking for any signs of sensor or wiring damage, can help prevent this code from appearing.
10. Will OBDII code B374A cause my 2014 Chevrolet Silverado to fail an emissions test?
- Yes, this code can cause your vehicle to fail an emissions test due to its impact on engine performance and emissions control systems.
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