![]() I have an electronic problem that I noticed on at least two other, different GMC trucks I’ve ridden in. Q: I was wondering whether the 2001 GMC Sierra HD 2500 Dual Cab truck has ever had an electronic recall. Another option would be to check with nearby 4X4 specialty shops and see if they can use their tool on your vehicle for possibly a few less bucks. These plug into the under-dash OBD-II data link connector and make quick work of the task. You could either purchase a device such as Rough Country’s Jeep QuickCal Speedometer Calibrator (applicable to 07-18 Wrangler JK models, about $140), or perhaps Hypertech’s Speedometer Calibrator, which can also serve as an OBD-II code reader, for about $220. Jeeps and other off-road vehicles are often modified in this and other ways, and there are several aftermarket sources for DIY speedometer/odometer reprogramming. My concern is if the factory scan tool parameters would provide for such a significant change in tire size. This could be something for the dealer to take a crack at. Unlike the old days when one could swap out the speedometer driven gear in the transmission or purchase a gear-driven cable adapter, this will require a software update to the powertrain control module or instrument panel module, as applicable. For example at an indicated 65, your actually doing 70.5 mph. Is there an easy and inexpensive fix to re-calibrate my speedometer so everything is correct based on the present tire size? Thanks.Ī: Your replacement tires cover about 8.5 percent more ground per revolution than the stock tires, making both the speedometer and odometer read low by this percentage, regardless of your speed. It came with P255/75R17 tires which are larger than the original tires which were P225/75R16. Q: Three months ago I purchased 2010 Jeep Wrangler Sport. San Jose Mercury News auto columnist Brad Bergholdt.
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