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)
Sign in to follow this  
frankc Z

Low/No boost after replace actuator rods - "electric actuator b2 s

Recommended Posts


I just did the SACH 2.5 clutch upgrade together with the replacing the actuator rods on my 2007 997TT. Prior to the work, sometimes under hard throttle, noticeably in 2nd or 3rd gear, above 4000rpm, the car seems like it is loosing power (even though it is boosting fully). Most people suggested me to replace the actuator arms/rods because they may be stiff due to corrossion, so I did.

After changing the clutch and actuator rods, it was running nice again. After a few short test drives, the car feels right and the boost kicks hard. However, once I hit the freeway the car loss power. The boost then was limited to 0.5-0.6bars max and fluctuates steadily under high throttle in high gear. The car decided to lose power suddenly once I hit the freeway as if the actuator is stuck. At first I also thought that it was (again) the intercooler pipe, but it was not.

Here are the errors that the PIWIS read on my car:

1.) "Boost pressure electric actuator b2 stiff"

2.) "Air mass ahead of throttle valves"

Another one was also something about 'faulr actuators' or so. I tried the "Adaption of boost pressure actually" in the PIWIS and it FAILED. It states that there is a fault and could not proceed on with the adaption process. I also thought maybe one of my turbos are dead, but after I parked the car for a while and restarted it, it seemed like the boost came back, and when I hit the freeway once again, the boost goes back to its 0.5-0.6bars routine.

I am pretty much stuck. Please let me know where I should look into.

Thank you.

Frank C.

Share this post

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

In another thread on another forum, the OP was getting code faults P5612 and P9510. The consensus of opinion was to check the turbo vanes for proper lubrication and had the car been checked for the vane lube recall issued by Porsche.

Share this post

Link to post
Share on other sites

I had same problem, just check that the rod didn't pop off that bottom pivot on the right side (b2). I got same error code on b1, and sure enough that rod was just hanging there. havent figure out yet how to make sure it doesn't happen again. but with over boost situation, the car will cut throttle in the higher RPMs. Yet make it look like you have PSI

Share this post

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.

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.

Sign in to follow this  

  • 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.