6L80E VSS settings

[Yellow05C6]

Pulling out hair - This is a '08 Tahoe E38 / 6L80E into an older truck. I've tried every setting under speedo parameters I can think of and still no VSS signal on pin 57. Truck drives / runs. I have the GM LAN working and have the Replicated TOC signal going into the E38. I've verified that the Replicated TOC signal is a pulse going into the E38 pin 71. Still no VSS output. Anyone want to share settings?

[Taz]

The issue is probably the Truck OS in the E38 ECM. Post your ECM tune - will take a look.

[Yellow05C6]

85 C30 6.2L (12617631)_0009.ctz85 C30 6L80 (24239353)_0002.ctzThanks Taz, you have helped me in the past w/a 411 issue. Tunes posted. Other than headers and air intake, all else is as GM built it. After reading many, many posts, I've earned this may be a truck problem. The 08 Vette uses the same OS so maybe that is a solution (?). But would it have comms issues with a 6L80?

[Taz]

The ECM tune you posted is not stock - someone has modified it with HPT.

Try the tune attached below ... hopefully it will activate the Speedometer output.

[Yellow05C6]

Thanks Taz. I'm using 7.5.7 Build 282 / and 8.2.2 Build 276 and cannot open the file. Are you using the May, September or October release?

[Taz]

The computer that I use for Forum participation is running V7 build 293 and V8 build 286 - from September, I believe.

On my day to day tuning computers, I am still running V7 build 230 - so that CAX files will load.