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Originally Posted by 06-H3
Do you need to reprogram the vehicle computer when going to the 285 tire? I switched from stock to the 285/75/16 back in May with no problems. About a month ago the SERV TMP light came on. The dealer is telling me it is because of the larger tire and needing to reprogram the computer to recognize them, at $180. Ok, but why has it taken almost six months for it to be an issue? They said the bands in the tire are fine, it's the new tire size causing the service message.
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You can reprogram the PCM for the difference in tire size, so that the speedo and odometer are correct. But tire size shouldn't affect the TPM system. As for reprogramming it, the steps are in the owners manual. You can do it yourself, FOR FREE! If that doesn't work, there may be a fault in the system (ie. bad sensor) and that should be fixed under warranty.