I bought my 2000 Expy a few months ago and found out that they come with power assist which means the power steering is very sensitive and almost feels loose. I thought my pump was broke but that is the way it is supposed to work.
I keep getting the P0401 code on and off every few weeks even after changing out the DPFE module. I cleaned the throttle body today and the CEL went off as soon as I put everything back together and started the truck. It only took about 30 minutes to remove and clean it and it was covered in...
You need to replace the DPFE module. Do a search on this forum to get more details. I just went through the same thing with my 2000 Expy and the $53 part fixed me up. Clean your TB also, it can't hurt.
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