kino1161

I hooked up the OBD because my CEL had come on. It showed a code of P2404. The truck seems to be running fine though. What do I need to do to remedy this? I am a DIY.....to a certain extent. :-) Thanks, all!

08 GTS

v10rick

Did you clear to see if it returns? If it does replacing the gas cap would be a basic first step.

chsu74

http://www.6speedonline.com/forums/c...ine-light.html

kino1161

I just reset the CEL on Sunday. Drove about 40 miles (20 miles each way) to an amusement park. Didn't come back on then. I usually only drive the truck fri - sun. I will see if it comes back on this weekend. Also, where do you purchase the gas cap from at a decent price? Thanks!

kino1161

In the link someone said, "Hose was loose and thermostat and gasket replaced." I am wondering what hose? To the thermostat?

ksozay

Had this error pop multiple times on my 08 GTS. Indy initially thought the code was being thrown because the thermostat switch was letting the engine get too hot before cooling. The reverse ended up being true. The thermostat switch wouldn't switch back off and kept cooling the engine (assumed engine was hotter than actual).

The code would pop and then after 7-10 days would disappear and then randomly pop again. Finally had the indy just replace the thermostat switch and problem solved. Might want to have the pump and thermostat done while replacing.

KS

v10rick

Replaced the cap on my GTS to fix a evap system check engine light.
Look for OEM, I purchased one on e bay, Amazon sells them as well
It could be more involved requiring shop diagnostics, but the cap you can replace in 5 min. at a cost of $20-30 bucks.

kino1161

Thanks, all!

v10rick

This P2404 has resurfaced.

Measuring the vacuum at the exhaust flapper, it was 10". Attaching an external vacuum pump to the same line and pumping to 10", engine oil started to seep back to the external pump.
I suspect the engine mounted vacuum pump has a defective seal.

Does anyone know the vacuum spec? Searched online but cannot find a spec for this pump.

RajDatta

In my case it turned out to be the vacuum pump. Changed the pump as well as all the 90degree elbow connectors and all has been well since.

v10rick

Thanks!!

Are the pump fittings off the shelf or did you order with the pump?

kino1161

Woah!!! I am sooooo late. I just happened to come across this page and found I never gave any results. Well, I changed the vacuum pump and the P2404 code never returned. :-)

stereonerd

Got a CEL this morning, pulled code 2404 - Evap. system leak detection pump sense circuit range/performance. I haven't checked mine out yet but I'm curious if you found oil in the line - this CEL followed a top off of the engine oil for me.

deilenberger

Ummmm... a clue to the year and model of the Cayenne you're asking about is likely to garner more intelligent answers to your questions. Just sayin...

stereonerd