C21,c28 and C29 on my K6 GSXR600 - GSXR.com
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post #1 of 2 (permalink) Old 08-12-2019, 07:22 PM Thread Starter
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C21,c28 and C29 on my K6 GSXR600

Just picked up a 06 gsxr600 with 10k on it. Looks really good but it has c21,28 and 29 codes going right now that i personally verified. Prev owner said it only needed the stva replaced. I havent dug in yet but i believe the butterflies and set all the way open at the moment. It idles at 2000rpm all the time. Runs 200-220 in 95 degree weather we are currently having. Just want to know where i should start or what i can test so im not replacing stuff i dont need to.
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post #2 of 2 (permalink) Old 08-12-2019, 07:54 PM
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Join Date: Mar 2013
Location: In the twisties around Hendersonville, NC
Posts: 8,083

Regarding the C21 fault. Have you checked that the sensor is actually plugged in. It is in the front of the air box top if I recall and needs to be disconnected to remove the box.

As far as the STVA codes (28 and 29), Chuckster is the guru on these things and you will find an in depth troubleshooting guide pinned to the top of the tech section.

It would help if you describe what the secondary throttle plates are doing when you first turn on the ignition. I'm guessing that you have checked the wiring and everything is plugged in?

You mention that the secondary butterflies are full open. This would cause the high idle cam to hold the throttle open. That is likely the reason for your high idle. This should be fixed when you get the STVA fixed.

Originally Posted by Chuckster View Post
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