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AutoCodes – GMC – B3773 GMC

B3773 GMC Code - Air Flow Control 7 Feedback Circuit Short to Ground or Open

Quick Answer

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the HVAC door actuators to regulate the airflow through the HVAC system. Common causes include Faulty Recirculation Door Actuator, Recirculation Door Actuator harness is open or shorted, Recirculation Door 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
B3773 GMC indicates Air Flow Control 7 Feedback Circuit Short to Ground or Open.
Common causes
Common causes include Faulty Recirculation Door Actuator, Recirculation Door Actuator harness is open or shorted, Recirculation Door 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 542
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 16, 2020
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Code B3773 GMC Description

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The HVAC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The HVAC module controls the direction of the actuator door by changing the polarity of the control circuits.
OBDII Code B3773 GMC - Air Flow Control 7 Feedback Circuit Short to Ground or Open - AutoCodes.com
B3773 GMC Code - Air Flow Control 7 Feedback Circuit Short to Ground or Open
What does this mean?

What are the Possible Causes of the DTC B3773 GMC?

  • Faulty Recirculation Door Actuator
  • Recirculation Door Actuator harness is open or shorted
  • Recirculation Door Actuator circuit poor electrical connection
  • Faulty Auxiliary Heating and Cooling Systems (HVAC) Control Module

How to Fix the DTC B3773 GMC?

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 B3773 GMC 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 B3773 GMC code?

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Need Help with the Code?

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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 B3773 GMC Code

1. What are the common symptoms of OBDII code B3773 GMC?

- Common symptoms include poor engine performance, rough idle, stalling, and illuminated check engine light.

2. What does the OBDII code B3773 GMC indicate?

- This code indicates a fault in the Air Flow Control 7 Feedback Circuit, specifically a short to ground or open circuit.

3. What are the possible causes of OBDII code B3773 GMC?

- Possible causes include damaged wiring or connectors, a faulty air flow control actuator, or a problem with the powertrain control module (PCM).

4. How can I diagnose the issue related to OBDII code B3773 GMC?

- You can use a multimeter to test the continuity of the wiring, inspect connectors for damage, and perform a visual inspection of the air flow control components.

5. How can I repair OBDII code B3773 GMC?

- Repair options may include repairing or replacing damaged wiring, repairing or replacing connectors, replacing the air flow control actuator, or reprogramming the PCM.

6. Can I still drive my vehicle with OBDII code B3773 GMC?

- It is not recommended to drive your vehicle with this code present, as it can lead to further engine damage and reduced performance.

7. How urgent is it to address OBDII code B3773 GMC?

- It is important to address this code promptly to prevent potential damage to other engine components and ensure optimal vehicle performance.

8. Can I reset the OBDII code B3773 GMC on my own?

- Yes, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

9. Will OBDII code B3773 GMC cause my vehicle to fail an emissions test?

- Yes, having this code present may cause your vehicle to fail an emissions test, as it indicates a fault in the air flow control system.

10. How can I prevent OBDII code B3773 GMC from recurring?

- Periodic maintenance checks, timely repairs of related components, and avoiding rough driving conditions can help prevent this code from recurring.

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