Hypertech speedometer calibrator for GM trucks 2006 to current. This will recalibrate the computer settings for those who have larger than stock tires, it will also recalibrate the truck for any change in rear end gear ratio. Buyer is responsible for verifying compatibility with their vehicle. Price is $200 or best reasonable offer.
I recently just added a 6 in lift kit and 35 in tires. I was wondering if the dealer could recalibrate the spedometer so I don't have to use an after market tuner and ruin the warranty I payed extra for on the computers. I know how to calculate what speed i'm going just not how off the odometer is going to be. Those are the two questions I am concerned with and as always all replies are greatly appreciated.
Okay, so this represents a ton of firsts for me: First time posting in a forum, first time owning a truck (or any vehicle for that matter), and the first time working on a vehicle, so I humbly ask for your patience and thank you in advance. Please understand that my knowledge of vehicle mechanics is fairly limited, but I do a little better with electronics.
I recently purchased a 1989 GMC 2500 for relatively cheap, and was assured that it was very mechanically sound, which it is, I think. I didn't realize that there were a lot of non-mechanical issues with it, even through a test drive. One such issue is with the speedometer. Usually, when it is colder outside, or I am making the first trip of the day, the speedometer works perfect. After that, though, the speedometer doesn't work, and I have to use the GPS on my phone. I have no idea where to start, other than pulling the dash apart, but then I will just get a stupid look on my face and not know what the crap is what. I did check all the fuses, and only one was blown, but more on that later.
Another issue is with the odometer. It claims just under 104k on it, which is amazing, until you realize that it is horribly inaccurate. Whenever the speedometer is not working, the odometer is not turning, so I assume that they are linked somehow. However, when the speedometer is working, only the tenth of a mile wheel spins, and nothing clicks over. Both of these can wait, however, until after I get the safety inspection done that is required yearly by the great state of Utah. Other issues are a little more pressing, such as...
Headlamps. How do I properly aim them? I did buy a Haynes repair manual from O'Riley Auto Parts, but it wasn't as specific as I would like. It listed two different kinds of headlights, and explained how to aim them, but what is on my truck looks like what both were described as. Another pressing issue is the tail lights. When the head lights are on, there is supposed to be a dim light in the tail lights, right? On the right side tail light, there is. On the left side, there isn't. On top of that, neither of the back up lights nor the license plate lights work. In addition to all this, the hazard lights don't work. Of course, it would help to check the hazard lights if I knew where the button to turn them on and off was located.
Now to the blown fuse. This one boggles me. The fuse was for the park lights, also required by law. It is a 25 amp fuse, which is easy enough to replace. However, when I replace it, no matter any thing else in the vehicle, the park lights come on, along with the head lights, and there is nothing I can do to turn them off except for removing the fuse. The park lights come on without the button even being used.
I know that this seems like a lot of questions to ask all in one post, and I'm sure that they are covered individually somewhere on the internet, but I really don't know if any of these problems are causing other problems to happen. I really need this truck to pass inspection, and I would really like to do the work myself, as I did get the truck so that I could learn this kind of stuff. And in case you are wondering how in the world did the previous owner get it to pass inspection, he had it registered in a county that doesn't require safety and emission checks. I really wish that I could do that, but I don't have a relative living in one of those counties.
Anyway, I do appreciate any and all help that y'all can give. Like I said, I know very little about auto mechanics, but I am trying to learn. Thank you again.
I just bought a very nice '07 Silverado 1500, regular cab, short bed, 5.3L with 58k miles on it. it's an upgraded work truck (LS) with, what I believe, the only options: pwr door locks and carpet. The gauge package only consists of speedo, tach, fuel level, and coolant temp.
My question is, is it possible that this truck did not come with a trip odometer? I can not find a re-set button anywhere near the gauges.
First I'd like to say this is my first post, and thanks for all the great information here and sorry for the novel.
I just purchased a 2003 Sub 2500 2wd 8.1L 4.10 rear ~132k miles with stock rims and tires (245/75/16) from a used car dealer, so I have no history info other than carfax. On my first test drive I noticed a very pronounced shift into each gear. It would hold a few hundred RPM more than I thought it should and when it shifted it was VERY firm. It was consistent and never any slipping, just firm. It made me think someone had an aftermarket tune with aggressive shift points/pressures. The dealer offered to have the local Chevy dealer check out the vehicle and they said there was no evidence of a tune but they did flash with the newest program. After the new program the truck shifted like a stock vehicle so I picked it up.
While driving on the highway I had the cruise set at 78 mph, my normal cruising speed. I noticed that I was catching far more vehicles than normal, I downloaded a speedometer app on my phone and this verified that the speedo was off by 10%, if speedo says 70 I'm going 77. I have verified I have the 4.10 by checking RPM vs Speed and all checks out.
Where does the speedometer calibration logic reside? PCM or BCM? When they loaded the new program did they only load one of those modules and not the other?
With everything stock and presumably stock code I'm confused as to why my speed and mileage are off.
If any of our wonderful techs on the site are in my area I wouldn't mind driving 30 miles or so to see you instead of my local dealership. I am in Murfreesboro TN.
Again thanks for any help you can give.
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