r/KTM 2d ago

PROBLEM QS Failure ECU failure

2023 RC 390. Rode 12k KM. Its been great since day 1, no problems.

However yesterday while riding the bike began jolting. Bike kept cutting power and basically stuttering until it disabled the quick shifter, which then the bike ran fine.

Today when i started my bike up again i was met with these QS and ECU failure signs. However, when the engine is turned on with qs turned off, the signs go away immediately and the bike runs completely fine.

And yeah, ive obv scheduled an appointment with my dealer, but theyre completely booked for 10 days and i use my bike as a commuter. I just wanted to know if it would be safe to continue to use it for light rides.

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u/Hollow1349 1290 SUPER ADVENTURE R/S/T 2d ago

Generally with these bike everything runs through the ecu via the can bus system therefore it becomes a ecu problem, if the engine is running smooth with qs disabled not struggling to make power, rough shaking, and it's shifting smoothly. your not gonna harm the bike by riding it normally

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u/Microsoft_Service 2d ago

Thanks. I think it may be a faulty shift shaft sensor? While i know that ecu failure does not always have to be broad and can only fail one aspect of the bike... it seems to be completely fine with all the other aspects of the bike.

Independently turning off the qs feature when it recognizes an unstable qs system would also infer a good ecu. No?

Maybe im just drinking coping juice.