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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?
The issue is probably the Truck OS in the E38 ECM. Post your ECM tune - will take a look.
Attachment 18992Attachment 18993Thanks 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?
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.
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?
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.