B3748
Air Flow Control 3 Feedback Circuit Range/Performance
B3748 is an OBD-II diagnostic trouble code meaning: Air Flow Control 3 Feedback Circuit Range/Performance. Common causes: malfunction of the air flow control solenoid valve (solenoid), mechanical stuck air control valve. Estimated repair cost: $56–167.
Symptoms
- Unstable engine operation at idle
- Reduced engine power
- Increased fuel consumption
- Check engine light comes on
Causes
- Malfunction of the air flow control solenoid valve (solenoid)
- Mechanical stuck air control valve
- Damaged wiring harness or poor contact
- Engine control unit (ECU) malfunction
- Contamination or wear of VVT system components
How to Fix
- Check the condition of the wiring harness and contacts in the control circuit
- Check the operation of the solenoid valve (solenoid)
- Clean or replace air control valve if necessary
- Check VVT system mechanical components for binding or wear.
- If necessary, replace faulty components
- Reset the error and check the system operation after repair
Related codes
Error B3748 by Vehicle Brand
FAQ
What does the B3748 code mean?
B3748 is an OBD-II diagnostic trouble code that indicates: Air Flow Control 3 Feedback Circuit Range/Performance
What causes a B3748 error code?
The most common causes of B3748 include: Malfunction of the air flow control solenoid valve (solenoid); Mechanical stuck air control valve; Damaged wiring harness or poor contact; Engine control unit (ECU) malfunction.
How do I fix a B3748 diagnostic trouble code?
To fix B3748: Check the condition of the wiring harness and contacts in the control circuit. Check the operation of the solenoid valve (solenoid). Clean or replace air control valve if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3748?
Limited driving only, diagnose soon
How much does it cost to fix B3748?
The estimated repair cost for B3748 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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