Hypertech752501 Speedometer Calibrator

This thing worked perfectly. I did have to try a couple of times to get to work. The instructions say to turn your car on but not start it. Mine kept getting hung up in the menu. I watched a youtube video and the mechanic said to start the vehicle and then plug the calibrator in. I did this and it worked perfectly. Did not take that long. Speed is right on.

Amazon indicated this would work for my vehicle even though the company website didn't list it as an option. At first it did not work but after an email to tech support I updated it to the latest revision of firmware and then it worked fine. The manufacturer couldn't tell me if it would work or not as they had never tested it with my engine. So yes this works with a 2016 Ram 1500 with the 3.6L Pentastar engine.

good product and easy to use

Hypertech 752501 Review - for Jeep Grand CherokeeNOTE ABOUT COMPATIBILITY: The Vehicle Compatility Tool here on AMAZON and on MOST other seller's web sites are not complete or correct. The compatbiity tool on Amazon said this was not for my Jeep Grand Cherokee but the Hypertech web site said it was. When I bought it from Amazon it worked. Go to the Hypertech web site to determine compatibility - don't bother with the compatibility chart on the Amazon product listing.As you probably know, your dealer will calibrate your speedo for a fee, but the MOPAR equipment is only able to program for tire sizes and differentials that are standard options for the car. I was quoted $96.00 before they figured out they could'nt calibrate to my over-sized tires.This was much easier than I expected. After putting on some new 18" Wheels/Tires on my Grand Cherokee that came from a 2013 Wrangler, the speed and odometer were off 8%. The 8% longer "gear ratio" feels much better to me with the 5.7 HEMI.The unit comes with a full manual on a CD but also has a 3 Step "Quick Installation" guide that fits on a half sheet of paper including illustrations. The simple 3 step guide is all that's needed unless you have complications. But KEEP THE CD. Its needed to connect to Hypertech for updates for new vehicles or if you want to pay for feature upgrades for the unit.SKIP MEASURING THE ROLLING DIAMETER YOURSELF - GO TO NEXT PARAGRAPHThe instruction callS for rolling the car 1 wheel revolution, marking the tires and garage floor with chalk; Then divide the distance by Pi (3.1416) This gave me 31.2" diameter. Factory Specs and my own direct measurement of the tire say 32". Rolling diameter (based on axle to ground distance) is less than full diameter due to load compression. During programming it lets you step through .25" increments to your desired "tire height" selection. I rounded down from 31.2" to 31" since the tires were brand new and would be .25" smaller diameter before reaching the mid-point in their service life.ITS EASIER TO CALCULATE "TIRE HEIGHT" FROM INFO ON THE TIRE RACK WEB SITE THAN BY MEASURING THE ROLLING DIAMETER YOURSELF.--------------------------------------------------------------------------------go to the TireRack web site and look up the specs for your tires. Write down the "Revs-per-Mile" figure.-Calculate (5280 x 12 / Revs-per-mile / 3.1416) = your rolling diameter in inches. (called "tire-height" on the hypertech programmer)or use (20268.1 / Revs-per-mile) = "tire-height"-For my tires this gave an accurate result equal to the tire-height that I measured by rolling the car one tire revolution.--------------------------------------------------------------------------------THE PROGRAMMING: After figuring out the tire diameter setting I was going to use, I plugged the unit into the diagnostic port under the dash and followed the prompts. 4 or 5 minutes later I was done.The first thing this unit does is read out any Diagnostic Trouble Codes on your car's computer. I had 4 DTC's but haven't looked them up yet. The programmer requires the DTC's be cleared before continuing. It does this for you when you select that option.RESULTS: When finished, the speedo and my GPS were an exact match.TIED TO SINGLE VEHICLE: You can't sell this unit or use it on another vehicle unless you use it to return your first vehicle back to factory specs. The full instruction manual says it will give you an error message if you connect to a second vehicle before un-programming any modifications made on the first vehicle.The full manual also says it's internal database of vehicles can be updated with your PC from the Hypertech web site. I wonder how long into the future it might keep working with newer cars.GREAT PRODUCT

Programmed my new tire size worked as it should. Started my 07 Aspen and my ABS, Traction control and Esp lights are on now. Error code C1078. If this programmer worked properly I would think it shouldn't be throwing a code. No I have no 4x4 or ABS. FOR THE MONEY IT LEFT ME WORSE OFF.