Bmw r1200rt lc ASC problem

Having Problems with your BMW R1200RT/R1250RT? or have some Maintenance and Service questions?
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motolaco
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Joined: Sun Dec 07, 2025 3:20 pm
Bike Model and Year: R1200rt 2015
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Slovakia

Bmw r1200rt lc ASC problem

Post by motolaco »

Hello. Iam new owner of Bmw r1200rt lc 2015.
I bought it with one problem. Yellow warning triangle is present or sometimes is flashing during driving. So i used only motoscan app to figure out what’s going on. I have present 2 faults 21f730 and 21f720 abs front and rear implausible. I deleted codes and went riding with live data vehicle speed, front sensor speed and rear sensor speed and all 3 values are correct and +\- 0,5kmh same. No differences or anomalies during driving.I tried also on central stand moving separate front and rear wheel and checked live data and all looks correct. I cleaned both abs sensors and checked rings for some damages. All ok.
Can you please advise me what to do next? Sensors i think should be ok.
After i deleted codes and start driving warning light flashes, than stay on, sometimes again flashing….but abs is working normally. I tried it in both cases.
Thanks a much for help!
Last edited by motolaco on Tue Dec 09, 2025 6:35 am, edited 1 time in total.
motolaco
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Slovakia

Re: Bmw r1200rt lc ABS problem

Post by motolaco »

Here are pictures
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IMG_5214.jpeg
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nadrol
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Re: Bmw r1200rt lc ABS problem

Post by nadrol »

Are the brake lever/pedal switches working properly?
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Stu
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Re: Bmw r1200rt lc ABS problem

Post by Stu »

Just found this if it helps at all

https://www.s1000xr.uk/index.php?topic=5830.0
motolaco
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Joined: Sun Dec 07, 2025 3:20 pm
Bike Model and Year: R1200rt 2015
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Slovakia

Re: Bmw r1200rt lc ABS problem

Post by motolaco »

I checked sensors gaps, brake switches, checked sensors wirings and this all ok.
But When i switch ASC off before driving , after maybe 50 meters of driving dashboard restart by itself (goes off and on) and after that is ASC again On.
nadrol
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Re: Bmw r1200rt lc ABS problem

Post by nadrol »

I don't have any experience with the later ABS systems used on your bike, but that sounds more like a computer problem or the wiring to it.
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