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Fixed!

A friend pointed me to this thread/post:

https://forums.bmwmoa.org/showthread.php?97769-Limp-Mode&p=1208256&viewfull=1#post1208256

I looked at the back of the throttle - just one connector - I pushed on it and it 'clicked' lol

Had to cycle the ignition on/off/on but the fault went away as soon as the 1st ON position, then the bike started fine and appears to be back to normal lol.

I had just installed the ILIUM risers so I'm sure having the controls hanging lightly pulled on the connector. I'm done enough stuff to know that if something goes wrong it's usually related to the last thing YOU did.. so.. MY BAD. But, at least another chuck on experience in case it ever comes loose in the future - that's the first thing to check.

This had happened far too often. You are not the first to report the same issue here, either for the '21 RT or earlier models. One big fault that BMW has (among few others) is the lack of good QA system in their manufacturing! Things like this, and a few other more serious issues, should never have gotten out of the production line!

 

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I have to blame myself on this one as it was fine before I installed the risers so I could have taken more time to check connections - I just wish the error said something more specific like - throttle position error - maybe the actual code might say that - I'll check the codes to see if they are specific to that. The connector could be a bit more secure in it's design I suppose.

Yes, that is probably true. Others have done that as well. If you have your GS-911 already, I am pretty sure that the code will tell you to look at the throttle. I don't use a GS-911, but the MotoScan/OBDLink setup instead. Much cheaper, and does the identical things, but a lot more cryptic than GS-911.

Nonetheless, I stand by what I said about QA and BMW! People have had the same issue as what you had, and hadn't done anything that may have caused the issue. Many of the wethead 1200s have cam timing that were way off, and that was from the factory. Lee (LAF) has a very good statistic record on that. I had my previous '15 RT checked by the dealer (less expensive that buying the special tools needed, and also to give some supports to my dealer) and the cam timing was correct, but the position sensor was off! How can things like this leave the production line? I am not sure if I should get my new RT checked!

 

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Glad you mentioned that. I hadn't seriously looked into alternatives to the GS-911 yet, but since it was using an OBDLink interface, I figures that the OBDLink tool that I used for my Ford might work with the right software. Will look into this further. With all the expensive BMW specific tools that I need to buy for my 2018 RT, saving by not buying the GS-911 would be helpful.

Once I had found that MotoScan app had pretty much matured, especially in English, I looked deeply into it, and have been using the setup for a few years now. Here is the thread that I had started on the subject: Alternative to GS-911. Of course you don't have to read the full thread, especially since you are using the OBDLink already. For anyone else who might be interested, note that you will not need the adapter cable IF your bike is 2017 or newer. EU mandated that standard diagnostic connector be used from 2017 onward, and so BMW had to comply.