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ksiesel

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    2018 Denali

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  1. TCM's contain learned values for shift quality. It's possible the term reprogram is getting used out of context here. It may simply imply that the rebuilder is resetting the values in the adaptive learning tables so it will more quickly be able to adapt to the new hardware.
  2. The pressure will not change with or without the weight of the vehicle on the tire. It will change pretty significantly with temperature though. If you never did a sensor relearn procedure on the truck after replacing tires, you can be sure it is still looking for the sensors in the old wheels. Each sensor has a unique transmitter number and this is what the TPMS module in the truck is looking for. The relearn simply changes this association. You can think of it just like a paired Bluetooth connection.
  3. Just a guess, but are you old tires still nearby your truck when you are at home? I suspect your truck may still be learned to the old sensors in the wheels no longer on the truck. Add to that you haven’t driven far enough yet for the TPMS faults to set for not being able to read the sensor (because it’s still at home and no longer in range). I’ve never heard of a 433 MHz sensor pairing and sending ANY data to a 315 MHz system like your K2xx truck is.
  4. FYI, GM did pair the 5.3 with the 8 speed on some packages - maybe not in 2015 though. I have a 2018 that came from the factory with a 5.3 and an 8 speed trans.
  5. My datalink short was right at the terminating resistor on the drivers side. You should be able to check this datalink circuit by measuring resistance from Can H to Can L with the key off and all harnesses/modules plugged in. There should be a 120 ohm terminator at each end and they are in parallel. A good reading will be around 60 Ohms. I believe you can check it at the DLC under the dash, but I don’t recall what pins.
  6. I had something similar with my truck while it was under warranty. It was the datalink wires shorting together up near the rear tire. The key switch is wired to the BCM and it has to tell the ECM to engage the starter relay via datalink. If those two aren’t talking, it won’t crank. I also had all the dash messages you have along with an outside temp reading of -40 (it was around 60 F then). This theory also aligns with your observation that a scan tool will not connect.
  7. I believe the wheels from 19+ will fit the K2, however the TPMS sensors use a different frequency so you will have to swap them or get new ones that work with the K2.
  8. Sounds like a vacuum pump failure. I’d recommend calling your dealer with the symptoms as I believe GM has a program covering these even beyond the warranty period. I’m sure others will be along to share specifics of that coverage program.
  9. Each sensor has a unique sensor ID. Your truck has a table that these sensor ID's are written into when you do the sensor learn procedure. If you removed the sensors from the vehicle (as they were pulled with the wheels), you will get a TPMS light after you drive enough. Having said that, if you put your old wheels and tires in the bed, your truck will go on reading them and not give any codes or lights. When you perform the TPMS learn procedure, what you are doing is telling the truck which sensor ID to write to memory that each wheel location (LF, RF, RR, LR) in that order.
  10. The dealer may be offering you a bit on the low side for your ‘17. One thing to remember is that you will not be paying tax on the trade in value so if the dealer offers $50k for trade and your sales tax rate is 7%, that would be $3500. If you were to do a private party sale, that’s how much more you’d have to sell it for to break even.
  11. It’s not a T1, but the magnetic ride on my 2018 Denali is impressive. It’s the best riding truck I’ve ever driven.
  12. Search for this "Fernco PQC-102 2" Qwik Cap". Its what I used. You don't need the clamp that comes with it. This works very well.
  13. In the 2018, it’s not really a seat cooler as there is no cooling module in the system. Instead, it’s a ventilation fan so until your cabin temp comes down (from the A/C), all they are doing is pulling hot air through the seat. In terms of flow, they pull the air through the seat and blow it out the back and bottom. There are two fan motors per seat, one for the bottom and one for the back. I have actually been pretty impressed with how much difference the ventilation makes vs just having a standard leather seat.
  14. How difficult was it to get the old one off the valve cover, and did you end up breaking any of the plastic off that you struggled to find among the rockers?
  15. Can you give the part number for this? Also, can you confirm that you didn't need to modify the locking grooves prior to installing?
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