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2003 Chevrolet Silverado help DTC code 1518 Chevy 2500 6.0

Tiny
BRAVESTJ
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
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.
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Friday, December 5th, 2014 AT 9:49 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That code is a communication issue between the TAC and the PCM and could very well be a wiring problem.
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Friday, December 5th, 2014 AT 11:27 AM
Tiny
BRAVESTJ
  • MEMBER
  • 4 POSTS
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
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Friday, December 5th, 2014 AT 11:32 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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
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Friday, December 5th, 2014 AT 3:15 PM

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