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AutoCodes – Generic – P2279

P2279 Code - Intake Air System Leak

Quick Answer

The Engine Control Module (ECM) monitors the volume of air consumed at idle speed. Common causes include Check for intake leaks, Faulty Mass Air Flow (MAF) sensor, Faulty PCV system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2279 indicates Intake Air System Leak.
Common causes
Common causes include Check for intake leaks, Faulty Mass Air Flow (MAF) sensor, Faulty PCV system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 38,407
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Dec 22, 2020
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Code P2279 Description

The Engine Control Module (ECM) monitors the volume of air consumed at idle speed. The ECM controls the Idle Air Control (IAC) motor in order to regulate the air flow through the throttle body. The amount of air flowing through the throttle body will normally determine the engine speed. If there is an Intake Air (IA) leak or a malfunction in the Positive Crankcase Ventilation (PCV) system excess air can enter the intake manifold affecting engine speed. The ECM uses sensor input in order to determine an estimated volume of air that is used during normal idle conditions. If there is any excess air, the estimated volume of air will be more than the expected value and Diagnostic Trouble Code (DTC) P2279 sets.
OBDII Code P2279 - Intake Air System Leak - AutoCodes.com
P2279 Code - Intake Air System Leak
What does this mean?

What are the Possible Causes of the DTC P2279?

  • Check for intake leaks
  • Faulty Mass Air Flow (MAF) sensor
  • Faulty PCV system

How to Fix the DTC P2279?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2279 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2279 code?

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Need Help with the Code?

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Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2279 Code

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