Hypertech Speedometer Calibrator

I just installed mine, and per suggestions, kept the USB cable plugged into the black calibration unit for future calibration with my laptop without taking apart the dash again. Glad I did…I have some tweaking to do as I am still about 3 mph off. FYI, I can confirm the new Hypertech units are different than the older ones in that there is not green interface board like in the instructions. Unplug instrument cluster, attach one white end of HT wiring harness to instrument cluster, attach other white end of the HT wiring harness to the end of the factory wire you removed from instrument cluster, and plug small black connector on HT wiring harness to black calibration unit. Pretty simple.

For those who also kept the USB cable plugged into the calibration unit, did anyone subsequently go back in and tweak some settings successfully? Were there any issues when you did so? Did you disconnect the battery to update the calibration unit since it interacts with the ECU?

I’ve been searching for a couple of hours now and can’t find where anyone left the USB cable plugged into the calibration unit, then successfully recalibrated with a laptop. I’m paranoid…I don’t want to plug it into my laptop and have juice already going into the calibration unit from the truck side, and it getting juice as well from the laptop side, and the calibration unit getting fried. Or worse, something happening to the ECU. Thinking I should disconnect the battery, plug the calibration unit into the laptop, reprogram it, unhook from laptop, and reconnect the battery.

Maybe I’m overthinking…

Thanks in advance!

 

I left mine with a usb plugged in - you just need to disconnect the battery to do the programming. I’m guessing there is probably a fuse you could pull to accomplish the same thing, but I hadn’t gotten that far yet. Have had no issues reprogramming this way, as long as the unit isn’t receiving power.

 

Jake…my man…I appreciate it bud!!

 

Has anyone had one of these units just die on them?

I used one to correct my 2020 with 295/70-18 with no issues. Swapped to 285/75-18 recently and decided to check my speedo yesterday. It was off quite a bit more than I expected, 53 at 50 on the speedo 65 at 60. Attempted to adjust it and never got a connection to either of my PCs. Looks like it wasn’t correcting at all anymore based off the speed difference.

 

Interesting shower thought just crossed my mind.. if you don't install one of these you're actually travelling more than what your truck "thinks", right? If that's true, then you're Odo will have less miles as well?

 

Did you disconnect the battery to remove power from it before trying to connect? I'm pretty sure that it won't connect with power since powered up is actively correcting the speedometer.

 

I removed it completely from the truck after not being able to connect to it when installed, tried a few different usb cables and 2 PCs with no luck. Seems like it just died because driving around today and I’m getting the same speed difference with it removed as I was yesterday before trying to update it.

 

I did. When it died every light on the instrument panel was on. The speedometer didn’t work either. It was in my truck for like two weeks when it died. That was my 15 and it was brand new to give you an idea of when that happened. Traded that truck in for a 19. Never had another issue besides that one.

 

I also verified mine worked as I had a Bullydog installed and used those gauges. That signal didn’t go through the HyperTech and I could watch factory and corrected in live time.