Remote Start Troubleshooting

j91z28d1 · Dec 3, 2024

Doubeleive said:
gm makes and has calibrations for "upgrades" you just have to message with them and tell them what you are trying to do, you need a paid vin of course and the part number of the module being added.
obviously they made these with different trim levels, so all they have to do is edit the calibration file they provide (upon request) to work with your vin.
all they have to do is look up the part number being added, find the associated calibration file. attach your vin to that file and save it.
then they just give you the calibration file number that you enter into sps to program your vehicle
that's my basic assumption of how that works, I do not know if they charge "extra" for that or not.
I know it can be done because there are gm service bulletins on "how to" that have been provided to dealers when dealing with upgrades
I didn't know this until after I had tried the radio upgrade and started looking into why it didn't work like I expected it to and that point I just said f-it I already was past doing it and made something else work.

I had no idea they would do that for you. that sounds like what it would take.

almost sounds to good to be true. gm isn't usually very helpful. what phone number would you call for something like that?

Doubeleive · Dec 3, 2024

j91z28d1 said:
I had no idea they would do that for you. that sounds like what it would take.

almost sounds to good to be true. gm isn't usually very helpful. what phone number would you call for something like that?

there should be a technical support phone number for techline or a option to message or email from your account
i know that once you do a calibration it gives you a case # and related information if you have a problem afterwards
1-800-828-6860 I would imagine support is for paid vin slots and they likely are not going to just answer random questions but I could be wrong.
probably going to need a account number when calling

j91z28d1 · Dec 3, 2024

maybe worth a call with the case swap. tell them what you got and what you need. by scanning a working 2 speed truck and get the software #.

can't hurt to try. amazing if it worked.

DaveO9 · Dec 4, 2024

j91z28d1 said:
maybe worth a call with the case swap. tell them what you got and what you need. by scanning a working 2 speed truck and get the software #.

can't hurt to try. amazing if it worked.

Yeah, I'm going to have to think on this one for a day or two. Talk of bricking the whole thing does cause a little concern for me.

Another concern I have is using my Chinese Tech 2 as a pass-through. I could just see there being some kind of GM prevention for that kind of thing.

Starting to wonder if aftermarket might be the way to go. This unit seems promising: https://fortin.ca/en/products/evo-rs-t-harness-included-kits/evo-gmt4/ Before buying I would try to get some clarity from them if their system would be affected by the ECM crank abort flag I'm seeing. (To answer your earlier question - yes, the whole problem comes down to the T-case swap. For some reason, the new TCCM is causing an ECM crank abort)

Is it even worth trying a local dealer for this? I'm guessing they would have to go through the same thing with tech support and getting a special upgrade calibration.

DaveO9 · Dec 16, 2024

j91z28d1 said:
I didn't really read thru the thread. is it a fault code from the new t case that's keeping it from auto start? if so, the other work around is if it's an option you might be able to use hptuners to disable that fault code reporting so that it doesn't set and prevent auto start.

I don't know forsure that would work, just a thought since I've used it to disable codes from few different sensors before.

I asked the local tuner I've used many times about this. He uses TunerCATS, but he thinks he might be able to help. He's asking about the fault code number:

"TunerCats might be able to disable the fault code, if you know what the "P" or "U" code number is.
Possibly there is an option in the System Parameters for Transfer Case Type that can be changed?"

Any thoughts on how I could get the fault code number? Would this be a "P" (powertrain) or "U" (network) or something else? If something else, he's saying he thinks the BCM would have to flashed.

Doubeleive · Dec 16, 2024

DaveO9 said:
I asked the local tuner I've used many times about this. He uses TunerCATS, but he thinks he might be able to help. He's asking about the fault code number:

"TunerCats might be able to disable the fault code, if you know what the "P" or "U" code number is.
Possibly there is an option in the System Parameters for Transfer Case Type that can be changed?"

Any thoughts on how I could get the fault code number? Would this be a "P" (powertrain) or "U" (network) or something else? If something else, he's saying he thinks the BCM would have to flashed.

IF there is one the tech2 should be able to see it after a failed autostart

j91z28d1 · Dec 16, 2024

you'd read the fault code with a scanner. like a tech 2 or something that can read the full list not just the ecm.

give him that code and see if it's in his list that can be disable. or he might be able to request it he added if his software is supported like that. I don't know anything about tuner cats.

I would guess he has a scanner in his shop that can read it for you too.

mikez71 · Tuesday at 10:27 AM

What year transfer case module did you replace yours with? I read something about about a change in protocol around '09.
Here is the info that made me think of you, from 'blindsquirrel' on hptuners forum.. Not sure if it applies to transfer case modules..

"You will need a TCM OS that's from the late side of the CAN comms breakpoint, your ECM is the late 127lb IFR variety. It won't talk to any TCM OS that was used with the earlier 63lb limit ECMs. Generally the breakpoint is 2009 for the early/late switch, but there is some bleedover depending on platform; 2008 anything is definitely an early and 2010 anything is definitely a late, but 2009 could be either."

Doubeleive · Tuesday at 11:34 AM

mikez71 said:
What year transfer case module did you replace yours with? I read something about about a change in protocol around '09.
Here is the info that made me think of you, from 'blindsquirrel' on hptuners forum.. Not sure if it applies to transfer case modules..

"You will need a TCM OS that's from the late side of the CAN comms breakpoint, your ECM is the late 127lb IFR variety. It won't talk to any TCM OS that was used with the earlier 63lb limit ECMs. Generally the breakpoint is 2009 for the early/late switch, but there is some bleedover depending on platform; 2008 anything is definitely an early and 2010 anything is definitely a late, but 2009 could be either."

that's interesting info, sounds like the canada version of the light switch (they have no option to turn off drl's, but a simple switch change to a american switch enables it again)

mikez71 · Tuesday at 11:39 AM

Interesting, the autosync configurator lists these DRL options..

Either way, glad I don't have Canda spec, eh?

Remote Start Troubleshooting

j91z28d1

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