You are correct, it is the computer. I had to take the dern e-brake completely out to get to it. Then I just slid out this "chip" . Best bet is to leave it out and sell it, I guess. I love the Evolution, but wish you could scroll back and forth faster between hp settings. Thanks for the info. Judging from your truck's credentials---you would know! I'll go with that. Again, thanks, RSP.