E38 Speedometer Correction

[VEGASROBBI]

I am having the same problem. 2011 Suburban 6l80 and everything I try is not making a change. I went +/- 10...20...30...40% on the H0105, messed with gear ratios. The vehicle has a 6.0 gear in it and 40 inch tires. Basically what I am seeing on a scanner is almost double of how fast the vehicle is going. Anyone have any suggestion on this?

I have had no luck with two 2011 Silverado's correcting the VSS. Any changes I make to the speedo parameters or gear ratio's have no effect; similar, to the problem I had a few years ago with the 09's.

I ended up using HPT and Hypertech to calibrate the VSS on these vehicles.

Any help is appreciated.

[joecar]

I have had no luck with two 2011 Silverado's correcting the VSS. Any changes I make to the speedo parameters or gear ratio's have no effect; similar, to the problem I had a few years ago with the 09's.

I ended up using HPT and Hypertech to calibrate the VSS on these vehicles.

Any help is appreciated.

Which V7/V8 software build versions do you have...?

[VEGASROBBI]

Which V7/V8 software build versions do you have...?

V7.5.7 (Build 209)
V8.2.1 (Build 200)

Thanks

[Tordne]

Have you tried making the changes to the same tables in the TCM at all? That's just based on messing with my E38/T43 vehicle some time back... Speed calibration is a bit of a dark art I'm afraid.

[koryenger]

Have you tried making the changes to the same tables in the TCM at all? That's just based on messing with my E38/T43 vehicle some time back... Speed calibration is a bit of a dark art I'm afraid.

Tried it all...Vegasrobbie hit the nail on the head...Im affraid its just not possible at this point in time...