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  1. DPC

    EGT sensor locations on L5P

    There is a temp sensor in the passenger side exhaust manifold but it is labeled as an EGR valve temp sensor position 1. Sent from my iPhone using Tapatalk
  2. DPC

    Random P0087 2017 L5P C&C

    Fuel pressure regulator #2 was the problem. Never threw a code for it but when it would act up the voltage would stay at 4.51V. while idling, should be around 4-3.90.
  3. DPC

    Random P0087 2017 L5P C&C

    Certainly something I'll check out. The dual tank system on the duramax has had issues since the LB7. Did more testing today. The truck acts like its running out of fuel. It will run for about 5 seconds max, die, and then reduced power. Also only seems to have the problem when the truck...
  4. DPC

    2017-2019 T87A shift tables

    That seems to be the case with this OS. I made some drastic changes in the normal part throttle shift tables with no change in shifting. I'll post the info I get back from HPTuner. OS: 24285377
  5. DPC

    2017-2019 T87A shift tables

    Have a trouble ticket in with HPT to try and sort this out. Sent them two data logs, one in normal shift mode and the other in tow haul. Big difference in shift points even though the tables are identical in the tune.
  6. DPC

    Random P0087 2017 L5P C&C

    I'll give that a look. Thanks.
  7. DPC

    Random P0087 2017 L5P C&C

    Have a 2017 GMC 3500 C&C dual fuel tanks throwing a random P0087 (low rail), reduced power, sputters, then shuts off. Wait about a minute, start truck, and runs fine. Will not happen while driving, only when you start the truck. If you start the truck and it runs, it will not give you any...
  8. DPC

    2017-2019 T87A shift tables

    Had a PPEI trans tune which raised WOT shift RPM but did not seem to change part throttle shifting based on the data log. I've been testing another tune with no luck raising part throttle shift points. ECM tables seem to be much more responsive to changes. Anyone been playing around with L5P...
  9. DPC

    2017-2019 T87A shift tables

    Are the part throttle shift tables active? Using HPtuners trying to raise part throttle shift points, no luck changing them do far. Thanks .
  10. DPC

    Late 2016 LML trans in an 18 L5P??

    Haven’t found any new info about this. Externally they look the same, not sure about the electronics or converter to flex plate differences. Haven’t had 2017 and up Allison apart yet. Sent from my iPhone using Tapatalk
  11. DPC

    Late 2016 LML trans in an 18 L5P??

    Can a 2016 LML transmission be made to work in a 2018 L5P? Have a fresh built 2016 LML transmission, customer backed out. Understand the input shaft and converter are different. Anything else need changing or not possible? Thanks.
  12. DPC

    Moving to Phoenix, AZ

    Thanks for the info, certainly going to get a realtor and take our time trying to finding a place.
  13. DPC

    Moving to Phoenix, AZ

    Going to be moving to Phoenix here in the next few months. Trying to get an idea of where to go. Have an 11 year old so schools and safety are on the top of the list. Wife will be working at the VA hospital, want to keep her drive at 45mins max. I will also be moving an entire shop and the...
  14. DPC

    Rolling Coal, P0087 Code, Odd Power Loss Situation, HELP!

    It's not your GPCM, the low fuel pressure is your issue. You don't have to unplug GPCM to reset your power, just turn off the truck for a minute and restart. You will have power again until the low fuel pressure code hits. I assume you already changed the fuel filter? You need a scan...
  15. DPC

    Filled Block w/ Stock Heads?

    https://www.duramaxdiesels.com/forum/threads/electric-water-pump.64101/ Talks about filled block stock heads and electric water pumps, heads failed. I've been eyeballing those cast iron heads...waiting to hit the lottery .
  16. DPC

    Replaced DEF Heater - Reductant System Malfunction Level 5

    No, it should go into a high idle mode and all you warning indicators should go off. Don't touch anything during the test (brake or gas pedal) and vehicle must be at operating temp.
  17. DPC

    Replaced DEF Heater - Reductant System Malfunction Level 5

    A Reductant System Malfunction Service Bay Test is required when the Service Emission System message or Service Exhaust System message is displayed on the driver information center (DIC). Not sure what scan tool you have but this is the test I run to clear the messages after replacing a DEF...
  18. DPC

    L5P performance builds (beyond just a built trans)

    Yes, in my quest to find a .bin file I was hit up on another site by a "euro" guy trying to sell me .bin files and mapacs. He wanted 3k for a .bin file with maps. He said he did L5P tuning for ALL the big US tuners...he also said he could convert .hpt to .bin. He had no idea how to use HPT...
  19. DPC

    L5P performance builds (beyond just a built trans)

    That's great! Can you explain how I can create an .XDF file in TunerPro using a L5P E41 ECM .bin file and then transfer to HPTuners with the user defined parameters? How to find addresses in the .bin file. or is there a better program to do this with? Thanks.
  20. DPC

    CP4 diagnose P228C P228B

    You could also try one of the smaller tunes and see if it holds. If the lift pump pressure is good the only thing left is the HP4 or injectors... if the Allison is pulling power you won't see it in the fuel pressure because the actual and desired will be the same. You could also log data...