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  1. T

    p1518

    One last thing. This is actually quite scary. My long term fuel trim came back to normal. I kid you not.
  2. T

    p1518

    Alright here is what happened. If you look at the picture below. I had directional diodes connected to my high beams, low beams, and Fogs. What is missing in this picture is the 3 relays for all three of these lights. What you see is this. When I turn on my low beams, my fogs come on as...
  3. T

    p1518

    I completely hear you. I am OK with electric issues. I know what I know but it is a little over my head to try to figure out something like this. I think may have found the problem though. I thought to myself, what was the last thing I did with the truck. Give me a few days and I am going...
  4. T

    p1518

    Water ever the acronym is, I have a throttle control module coming soon. This...
  5. T

    p1518

    Thanks again for the support and responses. This is driving me crazy.
  6. T

    p1518

    Sorry I am losing it. TCM is on the way. My ECM looks super clean. But then again so does the TCM. Car has been garaged for about 100k and then under a carport for the last 130k miles. Owned it since new. So it is pretty clean. Do you think maybe something in the ignition switch? There...
  7. T

    p1518

    Yes it was very clean like new inside. And I just went back out and it is back. P1518 by itself. Don't have to start the motor to get the code. Just turn the key to the on position. Well fellas, if you can think of anything else, let me know. I have a new used PCM on the way. We will see...
  8. T

    p1518

    So I disconnected both harnesses from the ECU. I disconnected the battery first of course and touched both ends together fora few minutes with the key in the on position for good measure. I cleaned with electronic spray, dried them to evaporating with my new TEMU hand air blower :D and...
  9. T

    p1518

    If it is not the TAC, it likely this issue here below??? - DTC P1518 sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness-i.e. cruise, brake. An inspection of the fuses may lead you to the circuit that is...
  10. T

    p1518

    SIGH!!!..... DIAGNOSTIC AIDS - DTC P1518 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank because battery voltage is low, ignore DTC P1518. Clear any DTCs from memory that may have set from the low battery voltage condition. - DTC P1518...
  11. T

    p1518

    Thanks for the link. It may be a bad connection between the PCM and TAC. Maybe I will pull of the connector at the PCM and see if there is corrosion in there. We will figure this out.
  12. T

    p1518

    I swapped out the harness some 30 or 40k ago and all has been well since. I just cleaned all the grounds again and checked under the fuse box as well to see if there were mouses chewing up wiring. Took TAC off and sprayed the harness and TAC connection points with electronic cleaner. Put it...
  13. T

    p1518

    I actually took a solid ground from the fire wall and grounded it directly to the engine a few years back. I will give it a tug though and see if that is an issue. Also 30K miles ago, I change the 706 cylinder heads. One had cracked. When I did this, I made sure both grounds back there were...
  14. T

    p1518

    Sorry yes that is what I meant. What a pain this is. Not the first time i have dealt with this either. I have two 2003 tahoes ( his and hers ) and both have had issues. These codes are different this time and it is very pervasive. Not too intermittent.
  15. T

    p1518

    One other thing, my long term trims are rather high. 5.5 at idle and 8.0 in drive and stopped. Short term fluctuates by hovers around zero to negative 1 to positive one.
  16. T

    p1518

    Throttle body only. I had a new spare TBS and I just changed out the throttle sensor ( only ) and it did nothing. I sprayed some cleaner into the throttle body and it is clean and smoothly operating. It was already relatively clean. Here are the updated symptoms. Very weird. I erase...
  17. T

    p1518

    I have already changed out the harness many years ago. This is an odd code to get all by itself. And it seems severe. I literally just turn the key to the on position without starting the engine and the code and reduced engine power came back.
  18. T

    p1518

    2003 Tahoe 5.3 with about 230k miles... thank you. Bought new
  19. T

    p1518

    2003 Tahoe 5.3 with about 230k miles...All right folks. I have a p1518 code and after I erase it I just turned the key without starting and it'll hit me again it comes with the reduced engine mode. This is a new one for me after 22 years of owning this car. Any feedback would be great. Thank you
  20. T

    Front parking brake cable replacement

    I was afraid you were going to say that... :)
  21. T

    Front parking brake cable replacement

    I know this is an old thread, but sure could use some feedback. How did you manage to replace the forward parking brake cable wihtout removing the assembly?
  22. T

    Growing up doesn't have to suck

    Looking Good IAMDUB! Hope all is well. The truck is running like new and strong since you and others here helped me get those new heads on. I have put roughly 20k miles and all good!:D
  23. T

    Engine dies - but why?

    Following! I hope you all are doing well. Car is running like a dream since (with all your help) I replaced the 706 heads with 799's. Thanks again!
  24. T

    Advice please

    LOL, I once drilled a hole into the wall ( don't ask why ) in the garage. I found the stud with a stud finder and I missed with the drill to the right by millimeters. But I didn't miss the copper water pipe that was right there apparently. Drilled a hole in it. Turn the main water off and...
  25. T

    Rear brakes still surging

    I assume this only happens as you are coming to a stop and you can feel the undulating? If it were your front brakes you would feel it in the steering wheels as well. But the back brakes tend to give you that undulating or surging feel. I had this as well when braking with only about 10k miles...

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