Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

Hi, I have a 2008 Porsche Cayenne with a a CEL for P2404. The car runs completely normal and this is the only check engine light code. The only information I found on this is:

 

P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance

Possible cause of fault - Insufficient vacuum (system has a leak or blockage) - Short circuit to B+ in signal line - Leakage diagnosis pump faulty (diaphragm or reed switch sticks, internal solenoid valve stays closed or is blocked) -DME control module faulty

 

I was wondering if there was anyone with a similar issue or anyone with knowledge of a reported fix. If not, I'm a pretty good DIYer. Does anyone know how I should go about diagnosing this?

Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

  • Admin

:welcome:

 

P2404 Leakage diagnosis pump, Reed switch

 

Possible fault causes:
- Vacuum system leaking (The system consists of the mechanical vacuum pump (on the vehicle engine), the leakage diagnosis pump, the intake pipe switch-over valve and, where appropriate, the exhaust flaps in the rear muffler)
- Vacuum pump has mechanical fault
- Tank vent valve stuck in closed position
- Purge-air line between tank vent valve and carbon canister blocked
- Short circuit to B+/ground or open circuit in signal line

 

- Leakage diagnosis pump faulty
Link to post
Share on other sites
  • 4 weeks later...

Hi, I have a 2008 Porsche Cayenne with a a CEL for P2404. The car runs completely normal and this is the only check engine light code. The only information I found on this is:

P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance

Possible cause of fault - Insufficient vacuum (system has a leak or blockage) - Short circuit to B+ in signal line - Leakage diagnosis pump faulty (diaphragm or reed switch sticks, internal solenoid valve stays closed or is blocked) -DME control module faulty

I was wondering if there was anyone with a similar issue or anyone with knowledge of a reported fix. If not, I'm a pretty good DIYer. Does anyone know how I should go about diagnosing this?

I've seen this a few times. 1st I'd say if you have a vac. gauge get that on your vac pump on the back of B1 cyl head. Look for low vac./oil ingress from pump seals. Another easy test would be if you have ability to run a short test. Remove r/r wheel & inner liner gain access to carbon canister vacuum feed line place a vacuum bleeder on the canister and run your short test. If you pass it's a vac supply issue if you fail it's a carbon canister/electrical issue. My gut is bad vacuum pump

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Content

    • By FlashingBlade
      2002 C2 manual:
       
      Problem: when parked outside in freezing temperatures, oil leaks from the lower oil pump connector, item 7 in diagram below. When parked in a warm environment, it remains dry.
       
      Anyone had that problem? Should I replace the gasket #8?
       
      M96.01/02/03 Oil Pump M96.04
      WWW.AUTOATLANTA.COM    
    • By Tj 27
      I have a 2009 957 3.6l v6 Cayenne. The battery was dead a few days ago so I replaced it. It now starts up just as it should but when run a diagnostic it says the alternator voltage is high reading 14.72. I’m assuming I need to replace the alternator to remedy this. I can’t find any information about replacing the alternator. Has anyone attempted this? It looks like it might be straightforward  but my concern is whether or not the intake manifold has to be removed in order to get clear access. If anyone has any insight on this I would greatly appreciate it. 
    • By Roly
      Does anyone have a wiring diagram for the seat on a 2008/957 Cayenne which they can let me have?

      I’m trying to chase a fault where the passenger seat will motor up and down and the backrest will adjust forward and aft, but there is no response from the controls to move the seat unit forwards and backwards, or the four-way lumber support control.
       
      Thanks in anticipation...
    • By denaliberry
      Hello Renntech Community. Hope everyone has had a lovely day/ evening. Well... After owning 2 previous porsche's there is no doubt we all run into A LOT of issues. I have an 04 Boxster S with 117K miles on her. Well taken care of, just recently had an oil change. While driving my car on the interstate i felt a drag in the acceleration.It felt like the clutch was slipping but after driving it a little more it cleared up...  (Previously was an oil leak, I tightened the drain plug and added more oil prior to this incident and all was well) Then, while driving the car would accelerate any more, I attempted to downshift but it kept happening. The car died after I pulled off on the highway and after continuous hours of attempting and failing I called a flat bed and had her taken home. I ran tests on the relay, All is well with it. I added gas and a octane booster to attempt to clean it out. That didnt work. Checked fuses and those are all good. I suspect a fuel pump but Im not sure. Thank you!
       
      - Hopefully this is all enough information to help me out 
       
      - Denali
    • By SPIRO
      Hi everyone.  My 2006 Boxster S suddenly started making a squealing noise.  Noise goes away at higher RPM, only to come back at lower RPM and at idle. Not related to gear or clutching at all. Noise seems loudest at the rear of the car; I can hardly hear it inside with the windows closed.  Is this a serpentine belt issue? Or the bearing of some engine accessory? I have 50,000 miles, and have already changed the serpentine belt once, around 4-5 years ago,  just due to age of the car. I have not yet had the time to open up the engine compartment to look further. If it's a belt, then I would expect more noise from inside the cabin, would I not?  I have attached a recording indicating the squeal going away when I rev the engine.
      Recording 26.wav
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.