I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Re: Is it harmful for the bike to ride with c28code om a k9
If it happened after a big service, that's all the more reason to troubleshoot it. These things usually fail because either the solder joints of the stepper motor inside the actuator break, or because the gear train of the actuator got stripped or broke. While these things generally can happen at any point, therefore also during/after maintenance, it's probably more likely not to be a coincidence. Perhaps it's just a matter of the linkage having sprung out of joint, or some electrical problem. For instance, make sure that the couplers of the TPS and STPS weren't mixed up, especially if you can see the dash in dealer mode shift up and down during cycling.