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  1. R

    Am I in Trouble?

    This is for my 2008 model, so yours would be a little different: Parts InformationOEM Part #Price Fuel Pressure Regulator Fuel Pressure Regulator 97384667 $475.76 Labor InformationSkill LevelMfg. WarrantyStandard Fuel Pressure Regulator Replace...
  2. R

    Stand alone ECM need start circuit?

    See attached. I couldn't have said it better myself, even if I knew.
  3. R

    2016 gmc 2500hd

    Take it easy on the new guy. Remember, you don't know what you don't know. He doesn't know what the problem is, may not have the code number(), may not know what is important to describe about his truck, nor what you want to know about his truck. We've all been there, mine was a long time...
  4. R

    Code PO128 Coolant Thermostat Performance

    Lots of reading material here: https://www.dtcdecode.com/Chevrolet/P0128.
  5. R

    Intermittent code P0098

    Some reading material for you attached to :https://www.dtcdecode.com/Chevrolet/P0098
  6. R

    Chasing a problem

    What year truck are we dealing with? Was this captured with a scope or something else so that you can look at the waveform now?? Did the signal drop out almost entirely? If so, what happened on the high-speed LAN at the same time, if you know? Ivan of Pine Hollow Diagnosis is working on a...
  7. R

    Chasing a problem

    With your symptoms, it sure sounds like an electrical problem, something is shorting out momentarily. Our trucks are getting old and the wiring harnesses are showing weakness. In my truck, I have replaced the wire loom on every harness that I could get my hands on. Many of them just crumbled. I...
  8. R

    B2555, u0199, p0381. Help

    Check your codes here and see what you can find out. https://www.dtcdecode.com/
  9. R

    Stand alone ECM need start circuit?

    What are you trying to accomplish? Why not just use the existing start system? Have you looked at the wiring diagram for your truck? They're available at https://www.gmupfitter.com/pages/body-builder-manuals There is a very good section in the ELECTRICAL MANUAL explaining how the starting system...
  10. R

    Vane Position Sensor Readings

    More info attached.
  11. R

    Vane Position Sensor Readings

    https://www.dtcdecode.com/Chevrolet/P003A
  12. R

    Need info on a P0380 code

    Make: Chevrolet Code: P0380 Definition: Glow Plug Range/Performance Description: Engine cranking, Glow Plugs "on", and the PCM detected glow plug voltage was below 4.0v, or with the plugs "off", it detected the glow plug...
  13. R

    Reduced power -- where to look?

    Attached. This for my 2008 LMM engine. I THINK yours might be the same.
  14. R

    Testing Wiring Harness

    Check your 5V ref and ground at the MAF connector. Appears you have a circuit problem. See attached.
  15. R

    Looking for help with P0335 and P0336

    Thanks for being persistent and reporting your fix.
  16. R

    P0872 help. I’m stumped

    Take a look here: https://www.dtcdecode.com/Chevrolet/P0872
  17. R

    Help with P0380 code after disconnecting battery.

    See this: https://www.dtcdecode.com/Chevrolet/P0380
  18. R

    Im in need of a 2006 lbz 80 way connector pinout

    https://www.google.com/search?q=Allison+80+Pin+CONNECTOR+diagram&client=firefox-b-1-d&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiqipvNzo3vAhXnHjQIHcv-BmYQ_AUoAXoECA4QAw&biw=1536&bih=694
  19. R

    Trying to identify a key-on switched circuit, dashboard fuse box, '13 3500HD LML

    I didn't analyse the attachment, but it sure looks like someone knows it works for them, and I'd give it a try. Use a test light and see if the various feeds produce the results you want.
  20. R

    New to the Forum

    It's obvious you're near a port, but which one?
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