Throttle Valve Set Point Exceeded

Discussion in 'GS Boxers' started by Coastal Beemer, Sep 20, 2017.

  1. Coastal Beemer

    Coastal Beemer Loven Adventuren Supporter

    Joined:
    Feb 4, 2012
    Oddometer:
    21
    Location:
    Wilmington, NC
    Has anyone else had this issue with a 1200 GSA LC?? While sitting at idle, an engine symbol appears on the display and the idol speed picks up dramatically and the engine runs rough. I shut the bike down, start back up and all is normal while riding. When I stop for a minute or so at idle, the same thing occurs. My GS911 reports: "21FAA8: Level 2 monitoring of throttle valve 1, setpoint exceeded
    This fault occurred 4 times.
    The fault is not present now"
    #1
  2. LowOnFuel

    LowOnFuel In the crapper

    Joined:
    Oct 2, 2007
    Oddometer:
    1,724
    Location:
    Pacific Northwest
    Sounds like Limp Mode. You might want to check out this thread if you haven't already:

    http://advrider.com/index.php?threads/16-gs-limp-mode.1241121/

    Good luck...
    #2
    Callisto224 likes this.
  3. taz_va

    taz_va Long timer

    Joined:
    Sep 1, 2015
    Oddometer:
    2,838
    Location:
    Sunnyvale
    Something is causing the butterfly to get out of sync with the throttle, that does sound like limp mode territory. Yours could be either the valve itself, or a wiring issue.
    #3
  4. BluByU

    BluByU Long timer Supporter

    Joined:
    Feb 24, 2007
    Oddometer:
    1,082
    Location:
    Lost in America
    Just for curiosity sake Coastal, how many miles on the bike?
    #4
  5. Coastal Beemer

    Coastal Beemer Loven Adventuren Supporter

    Joined:
    Feb 4, 2012
    Oddometer:
    21
    Location:
    Wilmington, NC
    Almost 28,000 miles
    #5
  6. BluByU

    BluByU Long timer Supporter

    Joined:
    Feb 24, 2007
    Oddometer:
    1,082
    Location:
    Lost in America
    Thanks Coastal
    #6
  7. FreshupFreddy

    FreshupFreddy n00b

    Joined:
    Mar 18, 2016
    Oddometer:
    1
    Location:
    Navarre, FL
    I had this same fault code, 21FAA8. Occurred only at idle, and if I turned off the key and restarted, I could go on as normal. The short answer is that I found a vacuum hose, right behind the right cylinder throttle body had worked itself loose. See the lower center part of the photo below. Re-attaching this hose and adding a tie wrap immediately solved the problem for good! Thank God!
    20200601_090444.jpg
    20200601_093744.jpg
    #7
    Callisto224 likes this.
  8. Coastal Beemer

    Coastal Beemer Loven Adventuren Supporter

    Joined:
    Feb 4, 2012
    Oddometer:
    21
    Location:
    Wilmington, NC
    Yep. I had the same issue and fix. However I trailered 150 miles to the dealer who diagnosed the hose issue in about 60 seconds. It sure pays to look things over really well even before pulling out the GS911.
    #8
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  9. rdbonds

    rdbonds Breaker of Things

    Joined:
    Sep 3, 2014
    Oddometer:
    231
    Location:
    Dallas, GA
    I'm sure that was frustrating...but at least it's fixed!
    #9
  10. 10 bones

    10 bones n00b

    Joined:
    Jun 1, 2018
    Oddometer:
    2
    Location:
    Mojave
    I had this same fault code, 21FAA8, found the vacuum hose off like they said. Thanks everyone for the information.
    #10