I recently went through this with a ‘95 K1500, with 155K. I replaced the Sensor, but it continued. A friend who runs a garage pulled the speedo stet and sent it off for repair. When I got it back I notice the new needle, but it was operating good. We laughed, going down a two lane road, cars passed me, but I was doing 80.
you have no codes so the speed sensors are working. tires changed/smaller/also PCM has to be programed to make the correct signal from the transmission sensor .. did you put the correct tire size ? when did you buy it ..My 1996 chevy c1500 does the same it reads 70mph when I'm really doing 60 and I put a code reader that has live data and.the speed sensor says it says the same thing as Google maps I know they have a wheel speed sensor for the abs
Well, you can buy a cheaper speedometer recalibrating tool. Its basically a flash tuner but only does the speedo. They still arnt cheap though. Your other options are to try to get a trans shop to reset it, or a dealer, maybe, or a dyno shop. None of this will be inexpensive. The only way to reset the speedo is by reprogramming the ECM.Is there a way to recalibrate the speedometer without a high dollar code scanner