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FYI, "Pattern A" is tow/haul mode and "Pattern B" does not appear to be used: all the maps are filled up with 318 mph.

Hi all,

First post. Please excuse if this has been covered before, but I couldn?t find this topic by doing a search.

I have a 2009 Chevy Express 3500 extended van with a (puny) 4.8 liter motor...