ECU

[cannondale27]

Mine speedometer reads 5mph faster than gps. It has never been flashed and is a 2016 xtx.

Dealer may have flashed it before delivery. So have it done again.

 

[trailtamer]

My 2015 viper is reading around 6 mph slower than my Gps and our other 2015 viper. Odometer and both trips are also 25-30 miles less than other sled. I've zeroed them at the same time. Any ideas? Other sled yesterday read 110 miles, mine red 82. Zeroed them at the trail head side by side.

My dealer said the flash wouldn't resolve my speedo error. I insisted they reflash again.........bingo, it is fixed. I'm within 1 mph of gps.

 

[picasso]

I've had it reflashed twice. No change.