Honda Pilot EX 3.5L Codes: P0300, P0301, P0302, P0303, P0304, P0305 and P0306

VEHICLE:  2006 Honda Pilot EX 3.5L, V6, MFI, SOHC, Eng Desg J35A9

MILEAGE:  77,000

Customer Concern:

Multiple engine misfires. Codes: P0300, P0301, P0302, P0303, P0304, P0305 and P0306.


Tests:

1. Check the Exhaust Gas Recirculation (EGR) valve voltage on the scan tool, it should be 1.25 V when the EGR valve is closed. Sometimes the valve will stick, causing a rough idle.

2. If the engine misfires when driving, block or unplug the EGR valve and see if the problem goes away. If the problem goes away, check for a faulty EGR valve or EGR distribution problem.

3. Load test each ignition coil and see if one is breaking down intermittently. One faulty ignition coil can set all 6 misfire codes. Also verify the spark plugs are good.

4. If the engine misfires at idle and it's not an ignition coil issue or a lean problem, it is common for the valve to get tight and cause a rough idle with misfire codes.


Potential Causes:

Exhaust Gas Re-Circulation (EGR) Control Valve
Ignition Coil
Tight Engine Valves
Spark Plug(s)

Confirmed Fix:

Cleaned Exhaust Gas Recirculation (EGR) Passages

2006 Honda Pilot EX 3.5L Codes: P0300, P0301, P0302, P0303, P0304, P0305 and P0306