So I wanna do a pcm tune (pcmforless) and I was curious about the factory updates. I don't know if my vehicle has had any of the updates... I just bought it several weeks ago.... Talking to pcm of nc and apparently if I do choose to get the updates, I may need to do a CASE relearn.... Can anyone shed some light on this? Do I need the updates? Are any of them beneficial? Do I need them if I'm doing a tune?
Hey, I know we spoke through email but figured I'd answer publicly as well to help others who may search this in the future.
Usually, if there are updates, it's nothing major that you would notice. There aren't a whole lot of them out there for the H3 to begin with (I guess GM really tried with that one, haha!). You don't need the updates for the tune.
If you use the core program, you automatically get the latest file from GM (we use their software to put your VIN & operating system on the PCM). If you send in your PCM, or use the loaner program (where you're eventually sending in your own PCM for tuning) we do not apply the updates unless you specifically ask for them; reason being they are usually not major, and often will cause you to need a CASE relearn, which a lot of people don't want to fool with.
