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Re: P0748 code
Fixed it.
Here's the thought process:
As I mentioned, P0748 is Pressure Control Solenoid A, and the world wide web was telling me to look for bad connections, broken wires and such.
I had the TCM out of the truck last November when I was doing that ECM swap, so I thought it was possible I might not have re-made the connections well, or something like that.
Upon pulling the TCM back out I noticed the main harness of about 300 wires was laying on the power steering pump pulley and had worn completely through the convoluted conduit protective sleeve.
I peeled the sleeve off and looked very closely at all the wires. There was one very tiny light blue wire which had worn through the insulation and I could see copper, although it looked intact. Maybe it was shorting to ground via the pump and pulley.
Anyway - I cut the wire at that point and put a splice in there and put it all back together. Unhooked the batteries in order to do all this, hooked them back up, cleared the code and - problem solved.
Everything is buttoned back up now (with a new and better wire harness routing) and I am back in business.
Thanks,
K
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