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Type: Posts; User: tunerpro

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    You don't need an 8L90 guru. Your challenge has...

    You don't need an 8L90 guru. Your challenge has nothing to do with transmission calibration. The challenge here is getting the ECM's operating system, which is set up to talk to a 6L50 (T43), to...
  2. Try putting the stock intake on and see if your...

    Try putting the stock intake on and see if your fuel trims get back inline. If they do, then you need to adjust the MAF calibration table if you want to use that zzp intake. If they don't, then...
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    There is no "richening" the idle mixture. When...

    There is no "richening" the idle mixture. When the ECM is in closed loop, it self balances to ~14.7 based on feedback from the primary O2 sensor(s). If that actual AFR isn't 14.7 or near it, then...
  4. Mechanical noise like ticking noises will be...

    Mechanical noise like ticking noises will be picked up by the knock sensors. If there's excessive noise detected by the knock sensors when there can't be any knock, eventually it'll set a fault code...
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    Oh! Well, that's somewhat encouraging, then. ...

    Oh! Well, that's somewhat encouraging, then. Thanks for sharing that tidbit. You still have the transfer case challenge. And, you'd have to run the Express van engine calibration to have any hope...
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    That's going to require some customized software...

    That's going to require some customized software for the transmission controller
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    It sounds like the ECM and TCM aren't...

    It sounds like the ECM and TCM aren't communicating with each other (U0100 from the TCM to the ECM, and U0101 from the ECM to the TCM).

    It sounds more like a wiring problem, than a tuning problem,...
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    Short answer: Forget it, it's essentially...

    Short answer: Forget it, it's essentially impossible.

    Long answer: Even if any version of the 8sp transmission bolt pattern matches the 2.8 Duramax, which I doubt does, you'd have to find a way...
  9. There's no "fix" for this unless you know how to...

    There's no "fix" for this unless you know how to modify GM's operating systems. It's a design feature of their software.
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    I doubt you'll get any help with this. As I...

    I doubt you'll get any help with this. As I understand the EPA rules, their jurisdiction applies to all vehicles with a license plate and registration in the United States, unless it's California,...
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    You can modify calibration settings in fuel pump...

    You can modify calibration settings in fuel pump control module and chassis control modules in certain applications, but that won't help you with what you're trying to do here.
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    You have to have the ECM unlocked before you can...

    You have to have the ECM unlocked before you can do ANYTHING with it.
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    Better check that it will work with these trucks...

    Better check that it will work with these trucks first. As I recall, the 19+ full size trucks have a different shifter position switch from what the T87A support, possibly an extra PCS as well, so...
  14. hpt doesn't support any Global B applications...

    hpt doesn't support any Global B applications yet. However, some Global A vehicles also use a wholly isolated gateway module. The 2021 Colorados have that as do some other vehicles.
  15. What kind of vehicle is it? I know that some of...

    What kind of vehicle is it? I know that some of the supported GM vehicles run into trouble with the serial gateway module blocking any comms from tools trying to do non OE things.
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    Idk, the C8 is pretty cool out of the box...

    Idk, the C8 is pretty cool out of the box...
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    You are requesting more of your fuel system than...

    You are requesting more of your fuel system than it can deliver, hence the fuel pressure drop. If this goes on long enough, the ECM will go into limp mode to protect your engine from damage. P228C...
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    You can update any ECU in your vehicle... with...

    You can update any ECU in your vehicle... with the current flash used in YOUR vehicle. Unfortunately, since you added features that weren't there when they built your truck, SPS2 isn't going to be...
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    It's because they didn't refresh the SUVs until...

    It's because they didn't refresh the SUVs until 2021 model year, unlike the pickups which got refreshed in 2019. Actually the pickups are getting refreshed again in 2022, and they will also use the...
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    Yep, that message means you've been caught red...

    Yep, that message means you've been caught red handed and your warranty is toast.

    Just kidding. That message is for dealership technicians performing warranty work with SPS2 to get reimbursed...
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    The SUVs used the E92 up through the end of 2020...

    The SUVs used the E92 up through the end of 2020 model year. The 2021 SUVs, however, use the E90, but it's Global B, and as far as I know isn't supported yet.
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    I think there's a misunderstanding here. The OP...

    I think there's a misunderstanding here. The OP is talking about a 2020 Tahoe, not a Silverado. They still used the E92, so, they do not need any "unlocking".
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    With a laundry list of codes like that, I'd start...

    With a laundry list of codes like that, I'd start looking at the electrical harness and grounds. I'd also recommend actually diagnosing each of those fault codes using the factory service manual...
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    I understand the frustration. But look on the...

    I understand the frustration. But look on the bright side, at least you can tune your truck. At one point it was looking like THAT wasn't ever going to be possible. :D
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    You can do this yourself. First you need a J2534...

    You can do this yourself. First you need a J2534 compatible interface. This is one of the cheapest ones out there:

    http://www.dashlogic.com/products/j2534/dashbridge_cx

    Then, you go to...
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