Ask Experts Questions for FREE Help !
Ask
    sstimothy's Avatar
    sstimothy Posts: 1, Reputation: 1
    New Member
     
    #1

    Jul 19, 2004, 02:08 PM
    03 GMC Sierra HD Tire Size Upgrade
    I recently purchased new tires for my 03 GMC 2500HD Duramax Diesel. The stock size is 245/75 and I moved up to a 285/75. This changed the ratio on my speedometer, Driver info Center, and Odometer. The DIC cannot correctly calculate MPG, range, or average fuel economy anymore, also the speedometer is about 8 mph off. Is there a chip I can change or reprogram the ECM to accomidate the new tire size?
    Sincerely
    Shawn Timothy
    tgiunta's Avatar
    tgiunta Posts: 3, Reputation: 1
    New Member
     
    #2

    Jul 25, 2007, 09:56 AM
    Quote Originally Posted by sstimothy
    I recently purchased new tires for my 03 GMC 2500HD Duramax Diesel. The stock size is 245/75 and I moved up to a 285/75. This changed the ratio on my speedometer, Driver info Center, and Odometer. The DIC cannot correctly calculate MPG, range, or average fuel economy anymore, also the speedometer is about 8 mph off. Is there a chip I can change or reprogram the ECM to accomidate the new tire size?
    Sincerely
    Shawn Timothy
    Shawn,

    I suspect by now you've received an answer to your question or have sold your truck. But, if not, maybe I can help. I just bought a 2002 Chevy Silverado HD and it came with a Superchips module for reprogramming my on board computer. Having read the accompanying material with the Superchips module, it mentions changing the on board computer if you upgrade your tires. I've never done it, but looks like it can be done. I offer two options; either buy a "Superchips" module (look at their website superchips.com) or go to a dealer and ask them to reprogram your computer to compensate for the bigger tires. Heck, if superchips can reprogram your computer, I'm sure the dealer can too. Hope this helps.

    Tg

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Bicycle Tire Pressure [ 10 Answers ]

I recently bought a bike and read the tire pressure to be between 40 and 65. This seems high to me as the pressure in a car tire is around 32 psi. In any case, what pressure is best and what determines whether the pressure should be 40 or more up to 65? Thank you, Rick

Bicycle Tire [ 3 Answers ]

I have an almost new (400 mile) Michelin Erilium bicycle tire in which the wire bead separated from the side of the tire. The tire was pressurized to 112 pounds. What woulod cause this failure? :mad:

Discount Tire [ 3 Answers ]

Hey everyone I had bent my rim and I took it to Discount Tire to get it fixed. They sent it off to Cali to get re chromed and fixed. They told me it would take 2-3 weeks and told my husband 3-4 weeks. The job actually took 3 months, they gave me a discount on it and were really rude because they...

Tire pressure [ 5 Answers ]

I have a question regarding the correct tire pressure for my 2000 Mercury Mountaineer (AKA Ford Explorer). The sticker on the inside of the driver door says the correct pressure is 26psi, but that would have been of the original Firestone tires (that were recalled) The truck currently has Goodyear...

Sierra white cedar fence [ 2 Answers ]

I recently installed a new gate and front fence, using pressure treated lumber and white cedar, dog eared planks. Anyone have any advice on preserving the fence ? Can I stain it?. What are some of my options.. Thanks in advance.. SWA


View more questions Search