LMC5 Instructions and brown wire mod
1st Gear
Joined: Apr 2025
Posts: 1
Likes: 0
LMC5 Help
Just got a 2000 Corvette base , automatic
Car cranks and after 5 seconds it shuts off. I can disconnect the negative battery cable and reconnect and it will crank and stay cranked until I shut it off. Once I shut it off and try to recrank it cranks for 5 seconds and shuts off. The previous owners installed a LMC5 bypass and I’m beginning to think it’s not installed properly.
Car cranks and after 5 seconds it shuts off. I can disconnect the negative battery cable and reconnect and it will crank and stay cranked until I shut it off. Once I shut it off and try to recrank it cranks for 5 seconds and shuts off. The previous owners installed a LMC5 bypass and I’m beginning to think it’s not installed properly.
Melting Slicks
Joined: Sep 2008
Posts: 3,138
Likes: 802
From: Espanola New Mexico
The LMC5 is not at fault here I believe, the having to disconnect the negative battery cable which allows the car to stay running is indicating that the BCM is at fault. Many corvette owners have experienced this same problem and have had to replace the BCM.
Safety Car
Joined: Sep 2000
Posts: 3,572
Likes: 420
From: Taildragers rule! USA1
All the above problems are why I would NEVER do the LMC-5 mod.
I'd use the "old school" column lock bypass (CLB), which I installed in my 2001 06 and never gave me a problem!
https://www.ebay.com/itm/11268711548...Bk9SR9bG84vCZQ
I'd use the "old school" column lock bypass (CLB), which I installed in my 2001 06 and never gave me a problem!
https://www.ebay.com/itm/11268711548...Bk9SR9bG84vCZQ
1st Gear
Joined: Jun 2025
Posts: 1
Likes: 0
Are there no other steps to get this fixed permanently? I read something about wiring in a matching resister so it doesnt even look at the key? Is it worth looking at replacing the key? I did all the steps (havent cut the brown loop yet) and still get this about 1 out of 3 starts, second time it almost always clears. Its more annoying and embarrassing than anything.
Melting Slicks
Joined: Apr 2021
Posts: 2,191
Likes: 82
Are there no other steps to get this fixed permanently? I read something about wiring in a matching resister so it doesnt even look at the key? Is it worth looking at replacing the key? I did all the steps (havent cut the brown loop yet) and still get this about 1 out of 3 starts, second time it almost always clears. Its more annoying and embarrassing than anything.
