Engine Idle Speed is Erratic or Engine Stalls on Honda Pilot

Problem Description and Possible Solution

The Honda Pilot may have issues with the idle air control system, causing:

The idle air bypass system is made up of vacuum lines, an idle air control valve (IACV), the throttle body, and intake manifold, and allows enough air into the engine to idle when the throttle body is closed. The OBD trouble code P0505 refers you to this system to inspect for failures.

The most likely cause is a dirty or failed IACV, but vacuum lines, intake manifold gasket, throttle body gasket, and IACV gasket should be inspected.

In all cases involving the IACV, the throttle body ports should be cleaned prior to installing the IACV onto the throttle body.


Problem Data
RepairPal Verified
Average mileage: 131,500 (72,000–180,000)
14 model years affected: 2003, 2004, 2005, 2006, more2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
21 people reported this problem
Viewing 1 - 4 of 4 comments
Started with engine surging at idle. Then, while in driving in lower gear, the engine stays at higher rpms and does not shift smoothly (jumpy). After a period, engine light came on and VTM light also. More breaking power needed to slow vehicle and some bucking was noted.
Also had a high idle and hard shift from park to drive or reverse. Replaced the IAC. Fairly easy to do.