2003 Chevrolet Silverado help dtc code 1518 chevy 2500 6.0

2003 CHEVROLET SILVERADO
130,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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BRAVESTJ
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Im stuck im a mechanic, and can do most things, my truck is throwing a p1518 code, pcm-tac module serial data, but does it when it wants to sometimes I can drive all day sometimes I can drive a mile, someone please help changed the app sensor, changed the g103,g104 ground wires, tried a tps, and a tac module please someone help im about to go crazy also has a brand new battery.
Dec 5, 2014 at 9:49 AM
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WRENCHTECH
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That code is a communication issue between the TAC and the PCM and could very well be a wiring problem.
Dec 5, 2014 at 11:27 AM
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BRAVESTJ
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What do I need to check I did the wiggle test I did the 5 volt reference test and have 4.93, new 02 and knock sensors, just tell me what to check
Dec 5, 2014 at 11:32 AM
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WRENCHTECH
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This is going to be a problem with the serial data wires between the TAC module and the PCM They are on pin # 12 0rg/blk and pin # 13 Dk bl/wht The TAC module is on the firewall, on the driver's side. http://i1198.photobucket.com/albums/aa448/Wrenchtech/104102620.gif They go to pins # 14 and 15 of the PCM connector C1 https://www.2carpros.com/images/external/104093460.gif
Dec 5, 2014 at 3:15 PM