This weekend I went to tune a local member of a colorado forum i belong to and everything went fine, the download of the stock file and the writing of the new file went smooth. He couldn't immediately drive the truck since he was stuck at work, anyways i assumed everything was fine because its the same safe tune i do on everyones truck i've done.
Truck is a 2005 Colorado ZQ8, Manual, Lifted, 3.42 gears (TRAC CONTROL and Locking Diff), 33's (32.7), K&N intake, Magnaflow exhaust.
Issue: After tuning the truck will show "LOW TRAC" in the Drivers Info Center but will not pull power or effect drivability. The truck drives and shifts fine but the warning shows up when in motion and goes off when stopped at a light and idling and re-appears again once the truck goes back into motion. This happens when the T/C button on the dash is ON (Traction control system active)
Also with the T/C button OFF, the ABS FAULT warning shows up in the DIC about 8-10 minutes into driving. So either way there is an issue with something in the computers.
Here's what i've tried and where i'm at right now...
1) I tried turning the truck back to stock to see if anything is broken mechanically or if it was in-fact the tune I loaded. We drove around the lot with no warnings or problems.
2) I loaded the tune with only the tire size adjusted to make sure it wasn't anything else I edited or changed in my tuning process, still have the error so it's happening when I do the commit from changing the tire height from the stock ZQ8 wheel which is on the stock program (25.7 I believe) to the new wheel and tire combo (32.7) 33 inch tires.
When we disable the traction control on the truck using the button on the dash the warning does not appear (duh i know) even with the adjusted tire size and changed I made to the program but just for arguments sake we tried it.
So thats where i'm at on this... i've spoke with a couple people and they think it's a possible disagreement between the BCM and PCM which is causing the errors to occur but not effect the vehicle besides put up the warning on the DIC.
Thanks for any help you leave in advance....
-Zach