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P2399: Diesel Intake Air Flow B Position Sensor Circuit High

Severity
Medium
System
Powertrain
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P2399 Mean?

P2399 is a diagnostic trouble code indicating: Diesel Intake Air Flow B Position Sensor Circuit High. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2399

Common Causes

Frequently Asked Questions

What does P2399 mean?
P2399 indicates: Diesel Intake Air Flow B Position Sensor Circuit High. The vehicle's computer has detected that the Diesel Intake Air Flow B Position Sensor is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P2399?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P2399 for extended periods may cause additional problems.
How much does it cost to fix P2399?
Repair costs for P2399 typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair Diesel Intake Air Flow B Position Sensor wiring for short to voltage
  • 🔧 Clean or replace corroded Diesel Intake Air Flow B Position Sensor connector
  • 🔧 Replace faulty Diesel Intake Air Flow B Position Sensor
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

P2300 Ignition Coil A Primary Control Circuit Low P2301 Ignition Coil A Primary Control Circuit High P2302 Ignition Coil A Secondary Circuit P2303 Ignition Coil B Primary Control Circuit Low P2304 Ignition Coil B Primary Control Circuit High P2305 Ignition Coil B Secondary Circuit P2306 Ignition Coil C Primary Control Circuit Low P2307 Ignition Coil C Primary Control Circuit High P2308 Ignition Coil C Secondary Circuit P2309 Ignition Coil D Primary Control Circuit Low