I've noticed this on every single 2004 GMC sierra I've logged. 2004 Silverados are fine. Haven't tried tahoe/suburban/yukon/XL though.

When I go to log any 2004 Sierra, in the Table Display in VCM Scanner, it shows <unsupported parameter> in the slot where Ignition Timing Advance (SAE) is at. I will then go and look in the PID list and its not there. All of the Advance PID's are there, but not Ignition Timing. Seems like a coding issue or something on the software end. Buddy of mine has a Silverado but has a 2004 Sierra PCM in it and it does the exact same thing. Experienced this with about 4 or 5 different trucks now. Not being able to log the actual timing is not letting me fine tune things.

Any ideas? Support?