You haven't described how you "changed it", so I don't know. The way the bands work is by simply relaying the current pressure to the computer and the computer determines whether the PSI is within range. If they are you don't have a problem but if they are out of range then the light is tripped. On some trucks the range is larger then on other trucks, not sure if it's a percentage or actual values. Some people have gone to a different PSI tire and haven't had a problem, others going with the same tire do. The only ones typically not having a problem are those that get new tires that have the same PSI rating as the pillar sticker calls for. Everyone else has to either inflate/deflate their tires to compensate or deal with the light.