P2391
Diesel Intake Air Flow B Control Performance
P2391 is an OBD-II diagnostic trouble code meaning: Diesel Intake Air Flow B Control Performance. Common causes: malfunction of the mass air flow sensor (maf), dirty or stuck air control valve. Estimated repair cost: $17–89.
Symptoms
- Reduced engine power
- Unstable idling
- Increased fuel consumption
- Black smoke from the exhaust pipe
Causes
- Malfunction of the mass air flow sensor (MAF)
- Dirty or stuck air control valve
- Open or short circuit in wiring
- Air filter dirty
- Malfunction of the engine control unit (ECU)
How to Fix
- Check the condition of the air filter
- Diagnose the mass air flow sensor and its wiring
- Check the air flow control valve for dirt and movement.
- Scan the ECU for other errors
- If necessary, replace faulty components
Related codes
Error P2391 by Vehicle Brand
FAQ
What does the P2391 code mean?
P2391 is an OBD-II diagnostic trouble code that indicates: Diesel Intake Air Flow B Control Performance
What causes a P2391 error code?
The most common causes of P2391 include: Malfunction of the mass air flow sensor (MAF); Dirty or stuck air control valve; Open or short circuit in wiring; Air filter dirty.
How do I fix a P2391 diagnostic trouble code?
To fix P2391: Check the condition of the air filter. Diagnose the mass air flow sensor and its wiring. Check the air flow control valve for dirt and movement.. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2391?
Yes, but get it checked soon
How much does it cost to fix P2391?
The estimated repair cost for P2391 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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