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Code 111 means that there are no error codes stored. You won't get that code when there are error codes. The single flash is the separator code between the continuous codes (errors that are present when you ran the test) and codes that are stored in memory from past errors.
Found this on another thread.
I checked my part number and sure enough!
The previous owner said his son had "done something with the valve body"
He put a new style solenoid pack in an older body style.
My electrical tests confirm that he did fry something inside this new solenoid pack. I guess I will have the parts store order one and test the new one with my meter to make sure there is a difference.
I can see how this guy got fed up with the truck and decided to offload it cheap.
Looks like he had a blown front seal, then this solenoid pack and the PSOM go out. If I were in his situation, I would probably offload it cheap too....oh wait, I AM!!! hahaha
You can get reman solenoid packs on ebay very reasonably priced.