B374A 2015 GMC Sierra 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 GMC Sierra 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 2015 GMC Sierra 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 2015 GMC Sierra?
- 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 GMC Sierra?
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 GMC Sierra 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 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- Common symptoms include poor engine performance, reduced fuel efficiency, and potential stalling or rough idling.
2. What could be causing the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- Possible causes of this code may include a faulty air flow sensor, damaged wiring or connectors, or issues with the air flow control module.
3. How can I diagnose the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- To diagnose this code, you can use an OBDII scanner to retrieve the specific fault code, visually inspect the wiring and connectors, and test the air flow sensor for proper function.
4. Is it safe to continue driving my 2015 GMC Sierra with the OBDII code B374A related to the Air Flow Control Position Feedback Circuit?
- It is not recommended to drive the vehicle with this fault code present, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.
5. Can I repair the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit myself?
- Depending on your skill level and access to tools, you may be able to address this code yourself by replacing the faulty sensor, repairing damaged wiring, or resetting the control module. However, professional help is recommended for accurate diagnosis and proper repair.
6. How much does it typically cost to repair the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- The cost of repair can vary based on the specific cause of the code. It may range from a simple sensor replacement costing around $100 to more complex repairs involving module replacement, which could cost several hundred dollars.
7. Will resetting the check engine light clear the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.
8. How long does it take to repair the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- The repair time can vary depending on the complexity of the issue and the availability of parts. Simple repairs may take a few hours, while more involved repairs could require a day or more to complete.
9. Can extreme weather conditions affect the occurrence of the OBDII code B374A in a 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- Extreme weather conditions, such as high humidity or extreme temperatures, can potentially impact the performance of sensors and electrical components, which may contribute to triggering this fault code.
10. Is it necessary to perform a driving cycle after repairing the OBDII code B374A in my 2015 GMC Sierra related to the Air Flow Control Position Feedback Circuit?
- Performing a driving cycle after repairing the fault code can help the vehicle's onboard computer system to relearn and recalibrate, ensuring that the issue has been successfully resolved.
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