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B374A:02 GMC Code - Air Flow Control Position Feedback Circuit Short To Ground

Quick Answer

The diagnostic trouble code (DTC) B374A:02 indicates a fault in the air flow control position feedback circuit, specifically a short to ground condition. Common causes include Damaged wiring or connectors in the air flow control position feedback circuit, A faulty air flow control position sensor that is unable to provide accurate feedback, Short circuits caused by moisture intrusion or corrosion in electrical components. 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:02 GMC indicates Air Flow Control Position Feedback Circuit Short To Ground.
Common causes
Common causes include Damaged wiring or connectors in the air flow control position feedback circuit, A faulty air flow control position sensor that is unable to provide accurate feedback, Short circuits caused by moisture intrusion or corrosion in electrical components.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 18, 2024
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Code B374A:02 GMC Description

The diagnostic trouble code (DTC) B374A:02 indicates a fault in the air flow control position feedback circuit, specifically a short to ground condition. This code is typically associated with vehicles equipped with electronic throttle control (ETC) systems, where precise air intake management is crucial for optimal engine performance. The air flow control system is responsible for regulating the amount of air entering the engine, which directly influences fuel combustion, emissions, and overall engine efficiency.

OBDII Code B374A:02 GMC - Air Flow Control Position Feedback Circuit Short To Ground
B374A:02 GMC Code - Air Flow Control Position Feedback Circuit Short To Ground

Common Causes of B374A:02 GMC

  1. Damaged wiring or connectors in the air flow control position feedback circuit.
  2. A faulty air flow control position sensor that is unable to provide accurate feedback.
  3. Short circuits caused by moisture intrusion or corrosion in electrical components.
  4. Issues with the engine control module (ECM) that may misinterpret sensor data.
  5. Mechanical obstructions in the air intake system affecting sensor readings.

Symptoms of B374A:02 GMC

  1. Check Engine Light (CEL) illuminated on the dashboard.
  2. Reduced engine power or acceleration, particularly during heavy acceleration.
  3. Poor fuel economy, with noticeable drops in miles per gallon (MPG).
  4. Engine stalling or hesitation during acceleration.
  5. Increased exhaust emissions, potentially leading to failed emissions tests.

How to Fix B374A:02 GMC

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring and connectors associated with the air flow control position feedback circuit for any signs of damage, corrosion, or loose connections.
  2. Check Sensor Functionality: Use a multimeter to test the air flow control position sensor for proper voltage and resistance readings. Replace the sensor if it is found to be faulty.
  3. Repair Wiring: If damaged wiring is identified, repair or replace the affected sections to ensure proper electrical continuity.
  4. Clear Codes and Test Drive: After making repairs, clear the diagnostic trouble codes using a scan tool and conduct a test drive to verify that the issue has been resolved and that the code does not reappear.
  5. Monitor Performance: After repairs, monitor the vehicle's performance and check for any recurring symptoms or codes to ensure that the issue has been fully addressed.

Cost to Fix B374A:02 GMC

The cost to repair a B374A:02 code can vary significantly based on the specific cause of the issue and the labor rates in your area. On average, you might expect to pay between $150 and $500 for repairs, which could include parts such as a new air flow control position sensor (typically $50 to $150) and labor costs. Labor rates generally range from $80 to $150 per hour, depending on the shop's location and whether it is an independent or dealership service center. In metropolitan areas, rates may be higher, while independent shops often offer more competitive pricing. It is advisable to obtain quotes from local repair shops for a more precise estimate based on your vehicle's specific needs.

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Information for Specific GMC Models

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:02 GMC Code

1. What does the OBDII code B374A:02 mean for a GMC vehicle?

The code B374A:02 indicates an issue with the Air Flow Control Position Feedback Circuit, specifically a short to ground.

2. What are common symptoms of code B374A:02 in a GMC vehicle?

Symptoms may include reduced HVAC functionality, inability to control airflow direction, unusual noises from the HVAC system, or a persistent check engine light.

3. What causes the B374A:02 code to appear on a GMC vehicle?

This code is typically caused by damaged wiring, a short circuit, a faulty actuator, or issues with the HVAC control module.

4. Can I continue driving with the B374A:02 code active in my GMC vehicle?

While the vehicle may still be drivable, HVAC functionality could be compromised. It’s best to address the issue promptly to avoid further damage.

5. How do I diagnose the B374A:02 code on my GMC vehicle?

Start by inspecting the wiring and connectors for damage or corrosion. Then, test the actuator and control module for proper functionality using a multimeter or scan tool.

6. What repair options are available for fixing code B374A:02?

Repairs may include replacing damaged wiring, repairing shorts, replacing the air flow control actuator, or reprogramming/updating the HVAC control module.

7. How much does it typically cost to fix the B374A:02 code on a GMC vehicle?

Repair costs can vary widely, but fixing wiring issues may cost $100–$300, while actuator replacement could range from $200–$500, depending on labor and parts.

8. Can a malfunctioning HVAC control module cause the B374A:02 code?

Yes, a faulty HVAC control module can result in improper airflow control and trigger this code.

9. Is the B374A:02 code related to the blower motor in a GMC vehicle?

No, this code specifically refers to the air flow control position feedback circuit, not the blower motor itself.

10. How can I prevent the B374A:02 code from occurring?

Regularly inspect the HVAC system wiring and connectors for damage, avoid excessive moisture exposure, and address minor HVAC issues promptly to prevent circuit problems.

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