Firmware Update Causing Speed Issues?

[Bevans99]

I have a 2021 Trek Rail 7. I took it in for service at a Trek shop last week and they mentioned the firmware needed to updated. Once I got the bike back, I have had issues with the speedometer jumping around and the motor cutting out at higher speeds. No error codes are being thrown. The Trek dealer talked to Bosch and now they want to replace the speed sensor to see if that resolves the issue. Curious if anyone else has had similar issues after a firmware update? I don't want to pay for a sensor replacement only to have it not resolved. I rode the bike the day before I took it in with no issues, so it seems that firmware is the culprit.

 

[fooferdoggie]

You checked the magnet placement right? I have had that issue with my nyon not making good contact but you have a purion?

 

[Stephen - Bosch Team]

I have a 2021 Trek Rail 7. I took it in for service at a Trek shop last week and they mentioned the firmware needed to updated. Once I got the bike back, I have had issues with the speedometer jumping around and the motor cutting out at higher speeds. No error codes are being thrown. The Trek dealer talked to Bosch and now they want to replace the speed sensor to see if that resolves the issue. Curious if anyone else has had similar issues after a firmware update? I don't want to pay for a sensor replacement only to have it not resolved. I rode the bike the day before I took it in with no issues, so it seems that firmware is the culprit.

This seems like the speed sensor is the root of your issue. I would think this is a coincidence at best with the software update. For that bike, the speed sensor is a Trek part. Whether Trek or Bosch on the parts on your bike, a 2021 model should be well within warranty. I would try a new speed sensor and report back with findings.

 

[Bevans99]

Trek replaced the speed sensor and the issue did go away. It looks to be coincidence that it happened the same time the firmware was updated. All good now.

 

[fooferdoggie]

Trek replaced the speed sensor and the issue did go away. It looks to be coincidence that it happened the same time the firmware was updated. All good now.

I hate when that happens. it always seems to happen to me on stuff.