2007 GMC Savana 3500 Questions

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At first it would come on here and there but it no longer comes on now but the fan that runs the heat to rear passenger seats work fine
I've replaced a lot of the electronics and I was told its the body control module
I did a diagnostic and it keeps saying to replace the front airbag impact. I already replaced it, but it's still giving me the same reading. Any idea why?
Started car put in drive van stopped moving wouldn't move after that had some friends there they said it's the brakes.
engine service/light remains on ,gauge reads 40 lbs.could this be bad sending unit.