GM Silverado: 2003 Chevy Silverado K1500 Ext Cab 5.3l V8 DTC

Posted on Feb 5, 2014

2003 Chevy Silverado K1500 Ext Cab 5. 3l V8 DTC codes P0740, P0753, P0758, P0785, P1860. I have 11. 73v at IGN 0. I have replaced the Ignition. I have removed an aftermarket Prolock security system. I have disconnected the wireing harness from the pass side of the Trans and checked for voltage at the T, A, B and C pins and found no power. I am assum

GM Silverado: 2003 Chevy Silverado K1500 Ext Cab 5.3l V8 DTC
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ing I have an open circuit between the fuse panel and the Trans. I have visually checked harness from Trans up the back of the block and over to the fuse box in the eng comp. Nothing obvious. Any, hopefully easy, ideas on how to correct this ok, on the passenger side main trans connector (the big round one), unplug, check the pink wire (terminal E) for 12 volts (it has constant power from fuse IGN0), this is the power source for the internal trans circuits. Let me know and we will go from there. Pete If terminal E does not have power then: 1. The IGN0 fuse is blown or 2. You have an open on that wire, in which case you can just add your own wire. But we need to determine if the open is between the underhood fuse panel to the trans, or between the underdash fuse panel to the underhood fuse panel. So i will give you a blown up schematic for that area and show you what added wire needs to be "piggybacked" on the harness, to get full power back to the pink wire. It will take a few minutes to do that. hang on. Use what is currently there for size reference and its preferrable to solder wires and use shrink tubing. Just cut the pink wire back about 1" from trans connector (its going to be hard to do) and splice there. The other end is easier to explain by the schematic i`ll give you. And i am going to get that right now. Customer : I have to run to parts store before they close. Not sure where you are but if its to late I can get...

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