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04-10-2023, 03:23 PM | #1 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,173
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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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04-10-2023, 10:23 PM | #2 |
Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 7,867
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Re: P0748 code
Good Work
Feels good to get it Fixed
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