Help understanding a problem code...

[RCWatchman]

I did a search but could not find help for this. I have a like new, 2010 Can-Am RS SE5 with 300, yes 300 miles on it. It runs great, shifts smooth as silk, everything works like new. I also have a Kool Metal intake, a Two Brothers FI tuner to support the intake and exhaust mods, but the check engine light is lit and will not go away. I have found numerous suggested things to cancel it but nothing seems to work. When I checked for any fault codes it displayed (21C). I have checked all of the obvious causes and everything I can do is up to snuff, brake fluid, oil, antifreeze, new battery. Can someone please tell me what that 21C code means? I am hoping that will lead me in the right direction. Please help, Thank you, Please...

 

[TheMariner]

It's a stab in the dark, but have you tried removing the Two Brothers Tuner to check it's not causing the Check Engine Light ?

 

[CloverHillCrawler]

I did a search but could not find help for this. I have a like new, 2010 Can-Am RS SE5 with 300, yes 300 miles on it. It runs great, shifts smooth as silk, everything works like new. I also have a Kool Metal intake, a Two Brothers FI tuner to support the intake and exhaust mods, but the check engine light is lit and will not go away. I have found numerous suggested things to cancel it but nothing seems to work. When I checked for any fault codes it displayed (21C). I have checked all of the obvious causes and everything I can do is up to snuff, brake fluid, oil, antifreeze, new battery. Can someone please tell me what that 21C code means? I am hoping that will lead me in the right direction. Please help, Thank you, Please...

21C doesn't sound like a fault code, are you sure you are not on the ambient temp. screen?