The dreaded Suzuki C46 FI failure code. It's strange, I hadn't seen a Suzuki with this FI failure code in a long time and then I see two in one week. The first one was on a GSXR750 and the second was on a GSXR600. There are two options to fix this problem. The first option is to replace the exhaust valve control unit which is pretty good a stopping working (and usually just as the bike has gone out of its warranty period) or the second option is to replace the exhaust system with an aftermarket item which does away with the need for the control unit. Either way it's not a cheap fix. The control unit costs $800+ or a replacement exhaust system can cost anything up to around $2000. The owner of the 750 wanted to keep the bike standard and went for the option of replacing the control unit. The owner of the 600 upon hearing the cost of fixing the issue decided he could live with a red flashing warning light on his dash.