Engine-Codes - Honda - P2279 Honda

P2279 Honda Code - Intake Air System Leak

- Code Popularity: 63,179 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC P2279 Honda?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Vacuum hose misinstalled
  • Throttle body air leak
  • Intake manifold air leak
  • Evaporative Emission (EVAP) canister purge valve failure
  • Valve timing incorrect
  • Manifold Absolute Pressure (MAP) Sensor range/performance problem

Code Tech Notes

There is a factory service bulletin for the following Honda Models:

- 2008-2013 Honda Accord L4
- 2006-2013 Honda Accord V6
- 2014 Honda Accord Plug-In
- 2006-2013 Honda Civic
- 2006-2013 Honda Civic Hybrid
- 2005-2013 Honda CR-V
- 2007-2011 Honda Element
- 2005-2013 Honda Odyssey
- 2005-2013 Honda Pilot
- 2006-2013 Honda Ridgeline


Just cleaned or replaced the throttle body and now you've got one or more of these symptoms?

- Fluctuating idle
- MIL on with DTC P2279 (intake air system leak)
- MIL on with P0507 (idle control system RPM higher than expected)

What's probably happened is the throttle plate is now in a different position from the one the ECM/PCM had learned.

To fix this problem, the ECM/PCM has to relearn the current closed throttle position.

1. Make sure all electrical items (A/C, audio unit, defogger, lights, etc.) are off.
2. Start the engine with the shift lever in P, parking brake on, and hold the engine speed at 3,000 rpm until the radiator fan comes on.
3. Let the engine idle for 10 minutes with the throttle fully closed.

⚠ Does your Honda have Safety Recalls? → Check here

How to Fix the DTC P2279 Honda?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for P2279 Honda Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P2279 Honda code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P2279 Honda Code Mean?

The Positive Crankcase Ventilation (PCV) system reduces Hydrocarbon (HC) emissions. The PCV system recirculates unburned air/fuel mixture (blow-by gas) into the intake manifold so that it is drawn into the engine and burned, thus reducing HC. If the PCV hose comes off at idle with the throttle closed, the amount of air supplied to the engine is considerably more than the amount of air the idle control system supplies. The Powertrain Control Module (PCM) estimates the amount of air supplied to the engine while the throttle valve is fully closed, and if the estimated amount is more than the upper limit, it detects a malfunction and stores a Diagnostic Trouble Code (DTC).

P2279 Honda Code - Intake Air System Leak

Need more Information on the Code?

Need more information on how to fix the P2279 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2279 Honda code diagnosed by a professional: Find a repair shop in your area