P2398 — Diesel Intake Air Flow B Position Sensor Circuit Low

What Does P2398 Mean?

P2398 is a diagnostic trouble code indicating: Diesel Intake Air Flow B Position Sensor Circuit Low. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2398

⚠️ Check Engine Light (MIL) illuminated
⚠️ Diesel Intake Air Flow B Position Sensor reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Open or broken wire in Diesel Intake Air Flow B Position Sensor circuit
🔍 Poor ground connection at Diesel Intake Air Flow B Position Sensor
🔍 Faulty Diesel Intake Air Flow B Position Sensor with no output signal
🔍 Disconnected or loose Diesel Intake Air Flow B Position Sensor connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P2398 mean?

P2398 indicates: Diesel Intake Air Flow B Position Sensor Circuit Low. 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 P2398?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P2398 for extended periods may cause additional problems.

How much does it cost to fix P2398?

Repair costs for P2398 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

🔧 Repair broken wire or restore ground in Diesel Intake Air Flow B Position Sensor circuit
🔧 Clean and secure Diesel Intake Air Flow B Position Sensor connector and ground points
🔧 Replace failed Diesel Intake Air Flow B Position Sensor

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2398: Diesel Intake Air Flow B Position Sensor Circuit Low