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C5 PCM replacement. HELP PLZ!

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Old Jul 10, 2018 | 11:23 AM
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Default C5 PCM replacement. HELP PLZ!

I need to swap my PCM out. Can someone please tell me which set of numbers here are crucial? ( if not all of them? )?? Any help is appreciated.
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Old Jul 10, 2018 | 10:30 PM
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The important number is 12200411. Or just 411 for short. That unit was used in a lot of GM vehicles from around 2002 plus or minus a couple years.

My 2002 Z06 has the same one. I bought a spare from an ebay seller for $90 or so. It's used of course, but it's clean and they flashed it with the right software and even matched the VIN. Haven't tested it in my car yet but it's been hooked up to my PC and sending/receiving the messages I expected it to.

Coincidentally, I and a couple other guys are working on free software to reprogram them, but it's probably a couple/few months away from being useful.

https://github.com/LegacyNsfw/PcmHacks
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Old Jul 10, 2018 | 11:44 PM
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Originally Posted by NSFW
The important number is 12200411. Or just 411 for short. That unit was used in a lot of GM vehicles from around 2002 plus or minus a couple years.

My 2002 Z06 has the same one. I bought a spare from an ebay seller for $90 or so. It's used of course, but it's clean and they flashed it with the right software and even matched the VIN. Haven't tested it in my car yet but it's been hooked up to my PC and sending/receiving the messages I expected it to.

Coincidentally, I and a couple other guys are working on free software to reprogram them, but it's probably a couple/few months away from being useful.

https://github.com/LegacyNsfw/PcmHacks
Wow that is cool. Keep us informed. What would you need to connect to it. Also would this elimate the need for a tech 2?
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Old Jul 11, 2018 | 12:41 AM
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Originally Posted by sirdano
Wow that is cool. Keep us informed. What would you need to connect to it. Also would this elimate the need for a tech 2?
The list of supported devices is here:

https://github.com/LegacyNsfw/PcmHac...pportedDevices

There's still some "secret sauce" that's not on github yet, but 99% of the code is there, and I think we'll do a release in a couple/few weeks that supports reading. Writing will probably take another couple months or so.

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Old Jul 11, 2018 | 10:10 AM
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Originally Posted by NSFW
The important number is 12200411. Or just 411 for short. That unit was used in a lot of GM vehicles from around 2002 plus or minus a couple years.

My 2002 Z06 has the same one. I bought a spare from an ebay seller for $90 or so. It's used of course, but it's clean and they flashed it with the right software and even matched the VIN. Haven't tested it in my car yet but it's been hooked up to my PC and sending/receiving the messages I expected it to.

Coincidentally, I and a couple other guys are working on free software to reprogram them, but it's probably a couple/few months away from being useful.

https://github.com/LegacyNsfw/PcmHacks
Thanks a lot man. Just don't want to tow it to the dealer after installing it, then they tell me it's not right. Trying to save some $$$$ and headaches.
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Old Jul 12, 2018 | 01:54 AM
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Default C5 pcm nomenclature

Originally Posted by sirdano
Wow that is cool. Keep us informed. What would you need to connect to it. Also would this elimate the need for a tech 2?
It's easy to get confused when trying to research this stuff. Earlier I read that it only matters what color the main connections are. I've noticed that most are red/blue, but I've also seen green tossed into the mix. While searching on eBay I did notice some sellers have the automatic trans versions separated. If you try to ask a salesman for info they'll basically tell you to take a hike so they can get paid...so I'm hoping this internet conversation will help others later on down the road. After all, if Corvette owners can't help one another then the world really is a gloomy place to be. LOL
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Old Jul 19, 2018 | 12:44 PM
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Originally Posted by NSFW
The important number is 12200411. Or just 411 for short. That unit was used in a lot of GM vehicles from around 2002 plus or minus a couple years.

My 2002 Z06 has the same one. I bought a spare from an ebay seller for $90 or so. It's used of course, but it's clean and they flashed it with the right software and even matched the VIN. Haven't tested it in my car yet but it's been hooked up to my PC and sending/receiving the messages I expected it to.

Coincidentally, I and a couple other guys are working on free software to reprogram them, but it's probably a couple/few months away from being useful.

https://github.com/LegacyNsfw/PcmHacks
So, I put the replacement PCM in and took it to the dealership to get programmed. They said it still won't start or even turn over. Guess I have to put the old one in and take it back to the tuner. Bummer
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