abs system many codes if there is software upgrade?

Diagnose AND repair THE CAUSE(S) of the codes , then perform any known updates.

A poor electrical ground under the battery tray may cause the ABS warning light to come on. clean it and tighten the ground and also the main ABS ground on the frame rail below the drivers door,do the same.

Grounds are the first to check. you do need a scan tool with abs data functions. Drive up to 25mph and see if all wheel speed sensors work. you should notice the problem right away. if it shows one of the wheel speed sensors not working but you know its good or tested and its good, then the problem is your EBCM. its not sending the correct +/- to that sensor. the curve ball on this one is the code c0455. which has to do with the steering wheel position sensor. check connection c101. that is the first thing. 2) if your scan tool can calibrate the yaw, DO IT. 3)if there is still a problem with the steering wheel position sensor replace it and be sure to use oem. aftermarket will cause a issue in a short period of time. Good luck let me know how this goes. NICK SIERRA AUTO CARE