SPONSORED LINKS

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.
SPONSORED LINKS
Friday, December 5th, 2014 AT 9:49 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That code is a communication issue between the TAC and the PCM and could very well be a wiring problem.
Was this
answer
helpful?
Yes
No
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
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, December 5th, 2014 AT 11:32 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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
Was this
answer
helpful?
Yes
No
+3
Friday, December 5th, 2014 AT 3:15 PM

Please login or register to post a reply.

Related Throttle Body Replace/Remove Content

VIEW MORE

Sponsored links