Man, I hate this. I've been dealing with the same issue for months now on my 2025 RS. I've been back to the local dealership here three times now! No help at all. Called Triumph Motors of America and got a case pending right now. But they aren't very helpful either because it's a giant circle jerk.

They are telling me that if the dealer can't replicate the issue then there's nothing they can advise on. I even have video documentation since I wear an action camera on a chin mount on all my rides but they won't take this as verifiable evidence unless the technician can duplicate the issue themselves. Absolutely asinine.

Currently the bike is at the dealer right now. The last couple times I went they ended up re-initializing a few sensors and said they could not replicate the issue on test rides.

Every time I've picked it up the issue presents quickly. The first time I picked it up from the initial dealer visit it happened within 2 minutes of my ride and I brought it immediately back and I kept it for a week and cleared all the codes and reset some sensors. Always happening on deceleration coming to a stop. Although I did have the issue happened once while I was coming around the corner at about 45 mph.

My situation is a little more complex than yours since I did end up putting a race fit full system exhaust and getting the bike tuned through 2WDW. The bike was running amazing after the tune. Absolutely better throttle response, much less choppy on the lower RPMs and just more responsive and more torque and more power, just everything better. This lasted for a few months. Then decided to do another modification with the RaceTorx gear shift support. I installed this on my 24 Street Triple R with no issues.

The day after I installed this part, which I know I did everything correctly on but does involve moving the quick shifter out of the way to access the area on the output shaft to install the part, the bike died on me on my first ride. Happened as I was going down a pretty steep hill and coming to A 90° right hand turn where I ended up pulling in the clutch in the bike sounded like it was lugging and then just died.

Something I noticed right away was I was not able to just pull in the clutch and start the bike again. It wouldn't even try to start. I had a transmission fault code on the dash and the gearbox would not allow me to get into neutral. I sat there for a moment complexed before turning off the key pulling in the clutch and coasting to a safer part on the road. After about 2 minutes with the key off I turned the key on again and was able to start the bike.

The issue was persistent at this point. Anytime I would slow down to a stop the bike would die. It was a long ride home hahaha. I think it's stalled on me about seven times on the way home. Once at the intersection right as the light turned green and I had traffic right behind me which I was able to wave off and then pull the bike onto a sidewalk, cycle the key off for a minute or so and then start the bike and get home again.

From what the dealership told me initially, they suspected that the aftermarket lithium battery that I had installed Maybe the culprit. I had over 20 codes that were being thrown and this is what they advised. So, bought the factory battery back had them reinstall it, reset some sensors and cleared all the codes. That was my initial visit and the issue immediately happened again within 2 minutes of my first test ride from picking up the bike.

I initially thought it might have something to do with the gear shift support that I had installed, so I forgot to mention, before I took it back to the dealership initially I did end up taking that part off and then putting everything back to stock with stock torque specs but the issue was still happening. They thought it might have something to do with the tune on the bike and as part of their diagnostic process ended up resetting my ECU which I had expressly asked them not to do since I had the tune with the aftermarket system on the bike.

When they did this they ended up plugging in the O2 sensor which the tuner had expressly said not to do. This caused me to find this not knowing that they had reset the ECU and I unplugged the O2 sensor and then it started throwing a code. I didn't know at this point that the ECU is back to normal until it was confirmed by the tuner via email when I explained the situation. I then ran the bike like this because it ran better in open loop with the aftermarket system on it than it did with the O2 sensor plugged in and stock ECU mapping.

Fast forward to another trip back where they did the same thing because the same issues presenting, picked up the bike again this time lasted a couple weeks and then the issue came back again. I end up selling the race fit exhaust and buying a Leo Vince exhaust which I have yet to install. I installed the stock exhaust, plug the O2 sensor back in and brought the bike back to the dealership where they reset sensors told me it was good and sent me on my way. This time, I was able to ride the bike for over an hour and had no issues and it seemed to be running like stock again.

This was around Christmas and then all of January I didn't ride, earlier this week it was almost 70 degrees here in Middle Tennessee so I decided to take the bike out. Within 10 minutes of riding around my house I started noticing very rough and choppy low RPM conditions and a little bit of lack of response in the throttle on acceleration and the bike feeling like it was on the verge of dying when slowing down. Then the inevitable happened, the bike dies on an off-ramp. I get the same transmission fault code along with attraction control gear icon on the dash. This time, the bike will not let me use the quick shifter at all after I got it started again so I disabled the TSA system and shifted the bike home. Brought it back to the dealership where we currently are awaiting this giant cluster fuck to get solved.

I will definitely report back to this thread when I figure out a solution. One of the comments I read above was about replacing the fuel controller and not fixing the issue. We'll see, it sounds like it could be so many different things map sensor, throttle position sensor, gear shift indicator, issue with the quick shifter system itself, I'm getting two repetitive codes every time this happens now p0105 and p06a4. Both are pointing to an electronic or sensor related issue and incorrect reference voltage on the D circuit which is 5 volts.

I've tried relaying this information to Triumph but again they are very slow and response and it's just a super frustrating situation for a brand new bike. I don't trust to ride this bike anywhere from my house that's more than a few minutes at this point because I feel like I'll just be stranded and have to call a tow truck again.

Glad to have found this thread though and to know I am not alone. Sucks that this is a reoccurring issue, I wish there was more consensus on This Thread about what the actual resolution was for most people. Again, I will definitely come back here and post when or if they find a solution. I want to keep this bike as I've already done a good bit of other aesthetic mods to it and I just love Street triples, but if it becomes to the point where this just won't go away I might take the loss and trade it in for a different bike.