B3747
Air Flow Control 1 Feedback Circuit
B3747 is an OBD-II diagnostic trouble code meaning: Air Flow Control 1 Feedback Circuit. Common causes: damper position sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $33–167.
Symptoms
- Rough engine idling
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Damper position sensor malfunction
- Open or short circuit in wiring harness
- Mechanical jamming of the intake manifold flaps
- Control solenoid valve malfunction
- Problems with power or circuit ground
How to Fix
- Check the integrity of the wiring harness in the area between the sensor and the control unit
- Check the resistance of the position sensor
- Check the mechanical movement of the dampers manually
- Check the operation of the control solenoid
- Scan the system for additional errors
Related codes
Error B3747 by Vehicle Brand
FAQ
What does the B3747 code mean?
B3747 is an OBD-II diagnostic trouble code that indicates: Air Flow Control 1 Feedback Circuit
What causes a B3747 error code?
The most common causes of B3747 include: Damper position sensor malfunction; Open or short circuit in wiring harness; Mechanical jamming of the intake manifold flaps; Control solenoid valve malfunction.
How do I fix a B3747 diagnostic trouble code?
To fix B3747: Check the integrity of the wiring harness in the area between the sensor and the control unit. Check the resistance of the position sensor. Check the mechanical movement of the dampers manually. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3747?
Limited driving only, diagnose soon
How much does it cost to fix B3747?
The estimated repair cost for B3747 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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