Can someone explain? Thanks

I know the description of each. But what do I need to do to correct?

The p500 means the truck saw a difference between the front a rear speed sensors. More than likely you have spun your rear tires somewhere, gravel, asphalt makes no difference. It also could mean one of the sensors is bad. The easiest way to determine is to clear the codes and see if it comes back. p and e 1693 mean the same thing, one computer is telling you the other computer has a code stored. The 1691 is a bit different. It pertains to the vp 44 injection pump and would be over my head to explain. Is the truck running or not?

Yes the truck running fine. No proems at all.

Sorry no problems at all.

I would suggest you clear the codes, drive it and see if any of them come back. If they dont, happy driving.

What would be the best way to clear the codes? Thanks

You need an OBDII scanner. If you dont have one just go to a auto parts store and see if they will do it for you. Most of the big chains have them and will do it for free.

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You need an OBDII scanner. If you dont have one just go to a auto parts store and see if they will do it for you. Most of the big chains have them and will do it for free.

Ok thanks