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  1. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    What I described is valid for my 2016. It may be different for a 2011. My 2016 Engine Control Module (ECM) has the capability to set the AFM to Enabled above 0 mph (my factory setting), enabled above some speed, or disabled. I set mine for disabled, and set the enabled above speed to 200 mph...
  2. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    Automatic Fuel Management (AFM) or Displacement on Demand (DOD). Anytime the Engine Control Module decides that not much power is needed, it will switch to V4 mode. Switching back and forth from V4 to V8 to V4, etc. all involve torque converter clutch slippage. I can be cruising on the...
  3. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I left the torque converter lockup essentially stock. I did set the target slippage to 0 (zero). HP Tuners recommended doing so and said that the 6L80 in the Corvette was set to zero target slippage. Since I don't try to be the first from one stoplight to the next, there is no harshness. The...
  4. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I have described how I set my TCM's shifting schedule speed parameters in this thread's post # 18 on page 2.
  5. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    You can do it with a desktop which has a USB port. You'd carry the desktop out to the car and connect it to the MPVI3. The only risk is the fact that the desktop does not have an internal battery. So there might be an issue with spurious electronic currents from the desktop power supply...
  6. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    This post describes my using the HPT VCM Editor for customizing upshift and downshift speeds in each of the six gears. My goal was to avoid putting a load on the engine at low RPM ("lugging the engine"). I can still use the Manual mode with the up and down rocker switch on the shift lever if I...
  7. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I used the following video for information on how to modify my transmission's Transmission Control Module (TCM) to set the target slip for the Torque Converter clutch (TCC) to zero. HPT 6L80 Tuning 101 After replacing the Tahoe battery, before doing any HPT stuff, the dashboard center display...
  8. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    Vehicle Control Module "programming" rough explanation. I don't know the actual approach that GM used. Typically there is an operating program installed/written in the control module, be it the Engine Control Module, ECM, which is a box in the engine compartment, the Transmission Control...
  9. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    Per my post # 11 above, I have already decided to ride the HP Tuners (HPT) horse, a result of my online research and viewing videos which showed the HPT product in use. From here on, please let's use this thread to describe my experience for others who may be considering the HP Tuners product...
  10. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    The newer Tahoes do not have the ground clearance of the older straight axle truck Tahoes. They are for driving the kids to soccer practice in town. Check the pictures above. Here is another up on the Bighorn mountains. Two miles up a rutted muddy road from the pavement. One of my nephews...
  11. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    I'm running a tank of 90 octane to compare MPG improvement. 11.0:1 is high compression, but, at part throttle, there is less fuel/air mixture to compress. I recognize that I will have more total power available with 91-93 octane, and increased MPG with more pressure on the loud pedal, but I...
  12. RobH

    Passenger lifter failure 79k 10/22, now Driver 107k.

    The Auto Fuel Management (AFM). You can disable it electronically (AFM disable) and, if desired, also replace the AFM hardware (AFM delete). You can see more at my post #11 at https://www.tahoeyukonforum.com/threads/hp-tuner-for-2016-tahoe-l83-6l80.148349/page-2
  13. RobH

    Constant repairs - 2017 Yukon XL SLT 4WD 5.3 Flex

    I hear your pain. My transmission went bad at 121K miles a thousand miles from home last year. I skipped part of the trip and was able to get home by babying the transmission. Then bought a GM reman transmission to get the three year/100,000 mile warranty good at any GM dealership in the...
  14. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    Sorry @RoadTrip, don't know about the BCM. But, I may have an answer in a couple of weeks. Edit: I sent you a PM. I bought an HP Tuners (HPT) package with two credits from Summit Racing. Edit: Two credits will allow me to update both my 2016 Tahoe LT's Engine Control Module (ECM) and 6L80...
  15. RobH

    2017 Tahoe Sudden Transmission Issues

    My transmission went at 121K miles. Typical Torque Converter Clutch (TCC) problem sent metal through the transmission. Replaced with GM reman to get the 3year/100K warranty. It now has one year on it and 15,000 miles. Apparently, the Transmission Control Module (TCM) is set up to allow the...
  16. RobH

    Need help please- 2019 Yukon 6l80e manual mode disappeared

    Bummer. One reason I don't like updates. They can change the behavior of unexpected things. Or remove previous functionality. Have you tried Doubeleive's suggestion to press the + or - button on the shift lever? Maybe that will summon "Manual" mode. Can you physically move the shift lever...
  17. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    Thank you. I suspected something like more credits for the TCM. Thanks again. Edit: It turns out that only two credits are required to modify both the ECM and TCM calibration files on the 2016 Tahoe.
  18. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I'm a retired IT guy. So I know my way around programming. I understand that the companies that provide the software to download the Engine Control Module (ECM) and Transmission Control Module (TCM) settings files ("tunes" or "calibrations"), edit the files, and then upload the modified...
  19. RobH

    HP Tuner for 2016 Tahoe L83/6L80

    I want to get the Active Fuel Management (AFM)/Displacement on Demand (DOD) turned off in my 2016 Tahoe. At the moment I am driving with the transmission in M5 which prevents V4 operation. If I operate the transmission in M6, AFM remains disabled in 1st - 5th gears, but in 6th the AFM is...
  20. RobH

    Upgrade package - exhaust/suspension/wheels

    What 91RS ^^^ said. When most people think about wheel size and/or tire size they are thinking about something like 275/55/20 or 285/45/22. What is pertinent for the speedometer is the over all circumference of the wheel/tire combination rolling down the street. The circumference (distance...
  21. RobH

    Tahoe got hit

    Sure sorry to hear that. I hope she's not too rattled. I hope she got a police report and pictures of both vehicles and the accident scene with the vehicles where they came to rest. I have been in a couple of accidents where what was claimed afterwards had no relation to what happened...
  22. RobH

    First problem after one year on 2018 Yukon XL Denali

    With the mileage and a bad lifter perhaps damaging that lobe on the cam, you're possibly in line for a new cam, Variable Lifter Oil Manifold (VLOM), and some other things that you didn't mention in your first post. If you haven't already done so, reading this thread may give you information to...
  23. RobH

    2017 Escalade/Denali L86 "requires" 93 octane - your experience?

    FWIW, this is a quote from the 2017 Escalade Owners Manual, "Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with ethanol levels greater than 15% by volume. Premium unleaded gasoline...with a posted octane rating of 93 is highly recommended for best performance and fuel...
  24. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    Actually, I would prefer to have my SUV towmobile look like a Chevy instead of a Cadillac. I don't like attracting more attention than necessary. 10,130 foot Cochetopa Pass in Colorado. in Idaho I've decided to stay with my 2016 Tahoe with the reman 6L80 and new brake rotors and pads...
  25. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    Yes on the modules. If I had it to do over again, I might have held out for a simpler LS Tahoe instead of getting my 2015 LT. True confessions, I put over 100,000 miles on a 1995 ex highway patrol 9C1 Caprice I bought in 2000 and sold with 208,000 miles on it nine years later when I retired...

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