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2004 gmc
26,436 Posts
A fresh PCMforless tune might have the new code in it. Email them. Certain independent GM mechanics that invested in tech tools and are up to date on their subscriptions can do it, IIRC. But none of them are going to be free. You might call around and see if you can find a GM dealer (doesn't have to be your brand vehicle) that will charge a fair price for ten minutes of work.

The new fan clutch has been extensively discussed. Start here:
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