GPEC5 vs GPEC2A in a 2022 Gladiator

[Minty JL]

Based on a conversation with Dave cs2, the gpec5 is hackable, the problem is the memory is volatile and will crash the ecu when a rewrite is tried most of the time.

But the OS for the computer would have to reside in non-volatile memory; if not every time the battery would go dead, the OS would be gone. The CMOS in a PC is technically volatile, hence the reason for the battery or capacitor; but even then, the CMOS only retains a ledger of the connected devices at shut down and updates when the system is rebooted. With that said, there are no programs or executables to operate from there.

Volatile memory should in theory only be used for momentary items ie ESS or Traction control; but then how would that explain how the Tazr can remember functions. Secondly, most of the momentary functions are retained in the BCM not PCM (based on my vast knowledge with GM products).

This is kind of becoming an interesting topic of conversation.........to many unknowns. Things I kinda want to know, merely out of curiosity at this point. I have a good buddy whos an electrical engineer that has done work for Dodge, GM and hell even NASA......do is brilliant. I will pick his mind and see if he can help dismiss some of the myths and shed some light on the other points.

Lets keep this discussion going!

More to follow......

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[ShadowsPapa]

But the OS for the computer would have to reside in non-volatile memory; if not every time the battery would go dead, the OS would be gone. The CMOS in a PC is technically volatile, hence the reason for the battery or capacitor; but even then, the CMOS only retains a ledger of the connected devices at shut down and updates when the system is rebooted. With that said, there are no programs or executables to operate from there.

Depends - some need to be manually updated, some read the attached devices as it "Boots".
There were times we had to update CMOS to handle newer drives as they were not a choice, or those that were automatically added, were not detected. Times I could remove a drive and it would freak out thinking it was still there but not seeing it.
But that's going back a few years.

Tazer likely uses the same tech as a UBS stick - and updates the list when you make a choice like pressing the ESS disable. It marks that line as ON and next start-up it goes through that file, likely like an autoexec file, and looks for true/false, etc. and if it sees "ESS disable-yes" it sends the signal to the truck hey, driver pushed the button!

I have a feeling that the issues with writing to a 5 is that things are in different locations and the wrong area is being overwritten, not that it's volatile.

Appears to me that the GPEC5 has other "emissions" stuff - and since I saw FCA report to EPA that the 2023s will have GPEC5, I wonder how they'll 'splain themselves of some with 2a end up in emissions failures.

 

[rharr]

it could be a bunch of things, non-volatile memory becoming volatile if forced into a rewrite. Or more likely is maybe there is a efuse in there, that gets tripped when a non-factory computer system tries to do a rewrite.

From what dave was saying, sounded like it's just a crappy poor quality ECU that is just unstable and doesn't like to be flashed.

This is all going off memory and i can seem to find the post where this was discussed.

 

[Minty JL]

I wonder if the GPEC5 has a background system/program much like the BIOS or UEFI. If the update or flashing of the ECU has some parameter that does match the stock BIOS or UEFI that's where the crashing would come into play

Back to @ShadowsPapa point of updating. When installing newer RAM, you would have to update the BIOS or UEFI to recognize it.

I know with GMs Global B platform, it utilizes a trusted module program (like a TPM on a motherboard) for the CAN/BUS. Even if you unlocked the PCM (GM Speak) or installed another PCM.....it won't work because it effectively will not pass the 3 way handshake with the other modules on the network (TCM, BCM, ABS and so on). Almost acts like an old Ring topology network, one broken link and the whole network is down.

I don't even want to talk about the encryption in use, glorfied password is only the start. Think about Public and Private keys and dealing with a Certificate Authority. Cyber Security in these newer vehicles is very much like an onion with numerous layers.

 

[ShadowsPapa]

I know with GMs Global B platform, it utilizes a trusted module program (like a TPM on a motherboard) for the CAN/BUS. Even if you unlocked the PCM (GM Speak) or installed another PCM.....it won't work because it effectively will not pass the 3 way handshake with the other modules on the network (TCM, BCM, ABS and so on). Almost acts like an old Ring topology network, one broken link and the whole network is down.

LOL - dang, now you are taking me back in time. But it still applies. Some things are just new versions of yesterday.
Token ring, anyone?

 

[jeep1]

Token ring, anyone?

Marginally better than dealing with Thicknet

 

[Minty JL]

LOL - dang, now you are taking me back in time. But it still applies. Some things are just new versions of yesterday.
Token ring, anyone?

Would you like a Hub with that LOL

 

[Dusty Rag]

My JTR 6MT was built 5-22 and has the GPEC2A. Supercharge me please.

 

[ShadowsPapa]

With the MT? And the fried clutches, busted transmissions behind an all stock 3.6?

 

[Dusty Rag]

With the MT? And the fried clutches, busted transmissions behind an all stock 3.6?

Who’s breaking their manual transmission? News to me. Clutch is easy change.

 

[Wildwilly4x4]

More updates to an older thread... my '23 Gladiator (built late in '22) 6spd manual has the GPEC2 PCM vs the 5.

 

[403Gladiator]

More updates to an older thread... my '23 Gladiator (built late in '22) 6spd manual has the GPEC2 PCM vs the 5.

I could be wrong, but my 23 Gladiator Rubicon 3.6 Manual appears to have the GPEC2 as well. I wonder if this is the case for all manual Gladiators…and if that means supercharging/tuning is a go for manual gladiators?

 

[Hootbro]

I could be wrong, but my 23 Gladiator Rubicon 3.6 Manual appears to have the GPEC2 as well. I wonder if this is the case for all manual Gladiators…

AFAIK, all manual Gladiators have the GPEC2 PCM.

 

[403Gladiator]

AFAIK, all manual Gladiators have the GPEC2 PCM.

I decided to ask Magnuson whether the GPEC2 made any difference…apparently not. Not sure if that’s because HP tuners can’t support the newer GPEC2 units, or whether Magnuson is washing its hands of the dead-end Gladiator supercharger market. Shame, as it is a pretty good looking unit.

 

[ShadowsPapa]

I decided to ask Magnuson whether the GPEC2 made any difference…apparently not. Not sure if that’s because HP tuners can’t support the newer GPEC2 units, or whether Magnuson is washing its hands of the dead-end Gladiator supercharger market. Shame, as it is a pretty good looking unit.

That suggested to me (this is a hunch - so don't take it as fact, please) that Jeep made some changes in the 2023 model year to tunes or some other functionality that they've not gotten into yet. I wonder what Jeep would have changed as other than dropping certain models in 2023, everything else seemed to be the same.

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