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Topic Review (Newest First)
04-24-2019 08:27 PM
boostedguy05 Would a Silverado ecm work?
04-24-2019 04:51 PM
TommyGloves Just did some quick digging...here are all of the part numbers that should interchange for 2005. Try searching on some of these to see if you can find a unicorn ECU.

12578554, 12596771, 12597191, 12597883, 19210071

These guys might be an option...expensive though...
https://www.ebay.com/itm/2005-GM-5-3...-/183321949585
04-24-2019 04:02 PM
cmntmxr57 TMI...
04-24-2019 03:51 PM
EmersonHart13
Quote:
Originally Posted by cmntmxr57 View Post
If water is getting in there, past the connectors, it could be shorting something out internally which would make sense given it's location.
My hot tub is having this issue.
04-24-2019 03:48 PM
cmntmxr57 If water is getting in there, past the connectors, it could be shorting something out internally which would make sense given it's location.
04-24-2019 03:45 PM
Ryan02Stang
Quote:
Originally Posted by b4black View Post
I worry when a mechanic says it needs a new ECM. They rarely go bad, and when the do, it's obvious. No check engine light, scan tool won't talk to it, etc.

Bad ECM = I can't figure out what's wrong, so lets change the most expensive part.
I get this for sure. But reading on Corvette forum this afternoon...there seems to be a good amount of people with this exact issue (car shuts off within 40 minutes of driving) and they all seem to say it was fixed with a new ECM.
04-24-2019 03:36 PM
cmntmxr57 Scan tool not talking to it could just be a bad DLC port. That's actually more common than you think.
04-24-2019 03:34 PM
b4black I worry when a mechanic says it needs a new ECM. They rarely go bad, and when the do, it's obvious. No check engine light, scan tool won't talk to it, etc.

Bad ECM = I can't figure out what's wrong, so lets change the most expensive part.
04-24-2019 03:34 PM
cmntmxr57 BAN! Never replace an LS motor with that!

Yes, steps for removal are remove wheel well stuff...
04-24-2019 03:08 PM
1quick Now I’m not sure this will work for you but back in 07 I bought an 06 supercharged Grand Prix and wanted to tune it but no one had cracked the pcm yet, I ended up swapping out the pcm for an 04 to test my theory that it would work and it did, so I bought an 05 used pcm out of an identical car and had a company do a custom tune on it worked fine and I ran the car like that for many years
04-24-2019 02:58 PM
Ryan02Stang Not even sure if a DOHC engine would fit in that thing!
04-24-2019 02:57 PM
EmersonHart13 That might be a one off!
04-24-2019 02:57 PM
Ryan02Stang
Quote:
Originally Posted by EmersonHart13 View Post
Time to swap in a different motor. I hear those new motors work pretty good....
I did tell him to do a Coyote swap and be done with this pile of garbage!
04-24-2019 02:54 PM
EmersonHart13 Time to swap in a different motor. I hear those new motors work pretty good....
04-24-2019 02:50 PM
Ryan02Stang
Quote:
Originally Posted by cmntmxr57 View Post
It's not available at Rock Auto either.

Also, the one on RA, if it were available, was a refurb. And sometimes GM can get sketchy on refurbed electronics. Particularly if the vehicle is in warranty, which I doubt this is, but still...

It sounds like if it truly is a PCM, that something internal is fried, broken or cracked and no amount of programming will fix it.
Definitely no warranty...my old man is the original owner from 2005 and hasn't bought any kind of extended warranty on it. Its actually been mostly a solid car up until this.

Apparently this part is housed inside the wheel well and ends up getting damaged from moisture.
04-24-2019 02:47 PM
Ryan02Stang
Quote:
Originally Posted by 98GrandPrixIraqVet View Post
Also isnt there a a few GM tuners that could setup a computer to be plug and play?

I mean remote tuning support is incredible now a days IMO.
The ECM has some sort of issue though, so it likely isn't as simple as being able to just tune.
04-24-2019 02:47 PM
cmntmxr57 It's not available at Rock Auto either.

Also, the one on RA, if it were available, was a refurb. And sometimes GM can get sketchy on refurbed electronics. Particularly if the vehicle is in warranty, which I doubt this is, but still...

It sounds like if it truly is a PCM, that something internal is fried, broken or cracked and no amount of programming will fix it.
04-24-2019 02:46 PM
Ryan02Stang
Quote:
Originally Posted by 98GrandPrixIraqVet View Post
So let me get this straight dealership has car for over 6 months and says they cant get a pcm but they are available through rockauto?

Sounds like great dealership!.............
LOL...they are not available through Rock Auto...they inadvertently had them on the site, but when I called they said not in stock and probably will never have stock again.

From what I can tell over a few days of searching...there is one guy in Spicer MN and one guy in Westchester NY that has bought up all the supply of these things. Guy in Spicer seems to be a junk yard, guy in NY seems to be a performance shop.
04-24-2019 02:45 PM
98GrandPrixIraqVet Also isnt there a a few GM tuners that could setup a computer to be plug and play?

I mean remote tuning support is incredible now a days IMO.
04-24-2019 02:43 PM
98GrandPrixIraqVet So let me get this straight dealership has car for over 6 months and says they cant get a pcm but they are available through rockauto?

Sounds like great dealership!.............
04-24-2019 02:05 PM
Ryan02Stang
Quote:
Originally Posted by Yaj Yak View Post
Did searching on here...seems one guy out of Spicer MN has all the listings on that site...and on eBay...no other suppliers.

I'm going to give this guy a call along with the guy from Corvette Forum. Thanks!
04-24-2019 01:36 PM
Ryan02Stang https://www.corvetteforum.com/forums...-em-quick.html

Looks like this guy might be my best bet, but his online reviews are iffy. Going to call him up and see what he says.
04-24-2019 01:18 PM
Ryan02Stang
Quote:
Originally Posted by Yaj Yak View Post
I mean, also, it just won't run? Or what's the deal?






I wonder if it's even the ecm that's bad....
It runs...and then randomly shuts off and then every dash light comes on. You can't get more than 30-40 minutes driving on it.

Quote:
Originally Posted by cmntmxr57 View Post
Have you parused Corvetteforum?
Yeah...reading on there this afternoon. Seems like a few people have the same issue, referred to some guys shop....guys shop has shit reviews about ripping people off. I need to keep reading on there.
04-24-2019 01:11 PM
cmntmxr57 Have you parused Corvetteforum?
04-24-2019 01:09 PM
Yaj Yak
Quote:
Originally Posted by Ryan02Stang View Post
Yeah...probably. Just sucks when its a part the car won't run without LOL
I mean, also, it just won't run? Or what's the deal?






I wonder if it's even the ecm that's bad....
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