Hey everyone. My engine light came on last night and I had the code read as p0456. I noticed that the car has power loss and is really quiet. I checked the fuel cap and it seemed a little loose so I tightened it. Is power loss a normal symptom of this code? Also, another code p3634 showed up. Any idea what this is?

 

I also have this problem... any input or update to this? Although I dont seem to have power loss or limp mode that everybody seems to get...

 

it seems to say that it is a very small EVAP leak. gas cap seems to be sealing correctly. I dont want to go to my dealer yet if it is an easy fix. Im going to try cleaning the gas cap and reseting the ecu to clear the code later on tonight. Ill post again later

Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause: A small leak in any of the EVAP hoses or fuel tank hoses A small leak in the purge valve or vent valve The EVAP Canister may be leaking

Read more at: OBD-II Trouble Code: P0456 Evaporative Emissions System - Small leak detected
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Have you looked at the FSM?

http://www.nicoclub.com/FSM/G37/Sedan/2009/EC.pdf

See page EC 333

Telcoman