I'm now running 38x13.50x20s. Re-calibrated speedo with PPE and abs amber light as well as brake light and service trailer brake light came on. Called Dan @ PPE and asked if he knew what the problem was. His first question was what size tires are you running, I told him. He said go to dealer and have ABS calibrated. Went to dealer, tech said he can't calibrate LMM. Called Dan again, told him what tech said, he agreed yep can't calibrate LMM. Has anyone else experienced this and any suggestion. BTW sorry for the long post. :beerchug:

I'm having the same problem. No one seems to have figured it out yet that I know of. Dan told me not to change the size of tire over a 35 in the computer when using PPE programmer and this keeps the lights from coming on.