Will Mil Set For A Smaller Set Of Tires?

[66chevelle]

I would like to upgrade to 18 in wheels on a 07 GMC Canyon (Colorado) 4x4, 3.7 engine, AT. Dealer specs tires that are 2 sizes too small. They say GM tested this size and it is the only one covered by warranty. They also say that the BCI would have to be reprogammed with a different tire size. Tire Rack and a tire dealer friend says stay with the correct 18 in size which the circumference matches the 15 in tire I have now. Will the MIL set when the speedometer is off by 2.1MPH? I could live with the speedometer not being exact but I don't want to have the BCI reset every spring and fall when I switch wheels and tires back and forth. I am using the 15s for snow. I hope a GM tech can answer this. Thanks.

[Zembonez]

I would like to upgrade to 18 in wheels on a 07 GMC Canyon (Colorado) 4x4, 3.7 engine, AT. Dealer specs tires that are 2 sizes too small. They say GM tested this size and it is the only one covered by warranty. They also say that the BCI would have to be reprogammed with a different tire size. Tire Rack and a tire dealer friend says stay with the correct 18 in size which the circumference matches the 15 in tire I have now. Will the MIL set when the speedometer is off by 2.1MPH? I could live with the speedometer not being exact but I don't want to have the BCI reset every spring and fall when I switch wheels and tires back and forth. I am using the 15s for snow. I hope a GM tech can answer this. Thanks.

 

First of all forget about the 100% Oscar Meyer Balony about the tire size voiding your warranty. Pure hooey. I might be able to understand the logic in that if you wanted 20 inches of lift and some 40 inch ground hawgs.

 

Second: If you stay the same overall diameter with the new tires there won't be a need to reprogram anything plus your speedo will be right. AND, it won't harm your truck in any way.

 

Third: If the hayseed at your dealership insists on getting into a warranty pi$$ing match... go over his head until you get satisfaction.

[BigJayDogg3]

Legally, they can't void your warranty unless they can prove your mod caused the problem. That is what I heard anyway. Call up a lawyer or something and make sure. Unless you are like me and just don't give a......

[66chevelle]

I don't really have any worrys about the warranty, I can always put the stock tires and wheels back on. I just wanted to know if the MIL will set with that difference of 2.1 MPH.

[Draenor]

I don't really have any worrys about the warranty, I can always put the stock tires and wheels back on. I just wanted to know if the MIL will set with that difference of 2.1 MPH.

No