![]() Simply follow the on-screen prompts and in just a few short minutes your speedometer will read true again! The secret lies in Rough Country’s foolproof GPS assisted technology, which monitors your vehicle’s speedometer and compares it to the speed tracked by the GPS. This plug and play device connects directly to your vehicle’s Diagnostic Link Connector (DLC) Port. When upgrading to larger tires, there will be a discrepancy between your actual speed and the readout on your speedometer. Your vehicle's computer is designed to track the speed based on your stock tire height. This easy-to-use Speedometer Calibrator uses GPS technology to quickly and easily reprogram your vehicle’s speedometer to match the output of your larger tires. ![]() I’d start diagnosis of the radio/clock with power and ground checks at the radio’s connector 1, terminals 5, 9 and 10.There’s never been an easier or more affordable way to calibrate the speedometer in your 2007-20 2WD/4WD model truck than Rough Country’s QuickCal Speedometer Calibration Device. A scan tool check of fuel level (info from powertrain control module) versus the instrument gauge would guide a tech to perhaps the fuel tank sending unit as opposed to a possible instrument panel/gauge fault. When the fuel gauge doesn’t work, does it go to full or empty? This should help determine a possible cause. Retrieving diagnostic trouble codes from the ABS system should shed light on the cause of the illuminated warning indicator. I think you may have three different situations. Certain Chevy and GMC trucks of your vintage were recalled for possible corrosion that might affect the ABS system’s front wheel speed sensors, resulting in undesired ABS intervention at low vehicle speeds. Any ideas?Ī: I searched and was unable to find a service bulletin, OEM campaign, or recall that would tie any of these faults together, as well as any common physical connection. Before I pay for an electronic diagnosis ($150), an electronic cluster (+$500), and installation fee, I wanted to get your input on this. An Internet research brought up a possible problem: electronic cluster. ![]() Specifically, the ABS/Brake light is almost always on the gasoline indicator works intermittently and the radio/clock almost never works. 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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