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LMC5 Pull Key Error still occuring

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Old Nov 7, 2025 | 06:03 PM
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Default LMC5 Pull Key Error still occuring

I have an 03 Z06 that is getting the pull key error displayed despite having the LMC5 bypass installed. Looking for some assistance in troubleshooting further or if there is some other bypass worth trying. Some things I noticed:
  • Initially the error would not show after the bypass was installed.
    • A day later when I picked up the car the error started showing intermittently.
  • After driving it for a few days I noticed that the error would only show on a cold start but not on a warm one.
  • I tried charging the battery overnight and voltage checked out alright but error showed when starting the car.
  • Today I disconnected the battery for about 15 minutes and then reconnected, started car and no error.
    • I did a few quick restarts and error remained gone, I did not drive the car.
    • Let it sit for 30 mins and started the car, no error and did not drive it.
    • Started the car after another 30ish minutes and then the error showed up again.
I don't have many diagnostic tools other than a multimeter at the moment. Any suggestions on what to try/check? Has been ongoing for a few months now.
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Old Nov 7, 2025 | 07:02 PM
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I've had the original CLB for over 20 years and still no issues to this day




Amazon Amazon
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Old Nov 7, 2025 | 07:16 PM
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http://www.complianceparts.com/lmc5trblshoot.html
If all else fails call Compliance Parts and discuss. They have by far the most experience with the LMC5
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Old Nov 7, 2025 | 08:21 PM
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Originally Posted by MyNameIsTerry
I have an 03 Z06 that is getting the pull key error displayed despite having the LMC5 bypass installed. Looking for some assistance in troubleshooting further or if there is some other bypass worth trying. Some things I noticed:
  • Initially the error would not show after the bypass was installed.
    • A day later when I picked up the car the error started showing intermittently.
  • After driving it for a few days I noticed that the error would only show on a cold start but not on a warm one.
  • I tried charging the battery overnight and voltage checked out alright but error showed when starting the car.
  • Today I disconnected the battery for about 15 minutes and then reconnected, started car and no error.
    • I did a few quick restarts and error remained gone, I did not drive the car.
    • Let it sit for 30 mins and started the car, no error and did not drive it.
    • Started the car after another 30ish minutes and then the error showed up again.
I don't have many diagnostic tools other than a multimeter at the moment. Any suggestions on what to try/check? Has been ongoing for a few months now.


Most likely a bad battery…being able to charge it fully doesn’t mean anything…have it load tested !!
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Old Nov 7, 2025 | 08:47 PM
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Originally Posted by C5 Diag
Most likely a bad battery…being able to charge it fully doesn’t mean anything…have it load tested !!
Yeah thats on my todo list for tomorrow.
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Old Nov 7, 2025 | 08:48 PM
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Originally Posted by Dads2kconvertible
http://www.complianceparts.com/lmc5trblshoot.html
If all else fails call Compliance Parts and discuss. They have by far the most experience with the LMC5
The guy that did the install has apparently reached out to them and not gotten very good support but I will try reaching out myself if battery tests good.
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Old Nov 7, 2025 | 08:49 PM
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Originally Posted by MyNameIsTerry
Yeah thats on my todo list for tomorrow.

Well let us know if a new battery fixes it.
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Old Nov 7, 2025 | 08:51 PM
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Originally Posted by jdmvette
I've had the original CLB for over 20 years and still no issues to this day




https://www.amazon.com/Corvette-Stee...s%2C167&sr=8-2
Are there installation instructions available online?
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Old Nov 7, 2025 | 08:59 PM
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Leaning toward the Battery also, I had that message a couple of times before my Battery went bad in my 02 Z06.
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Old Nov 7, 2025 | 09:46 PM
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I think the original CLB works better. You NEVER have to "call Richard" or do the brown wire mod. It just works!!

https://www.ebay.com/itm/12282723940...Bk9SR7D9z5XMZg
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Old Nov 7, 2025 | 10:55 PM
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Originally Posted by MyNameIsTerry
Are there installation instructions available online?

here's a video, it's very easy and like @ztheusa said, you don't have to call richard

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Old Nov 8, 2025 | 01:58 AM
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Moved to C5 Tech.
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Old Nov 8, 2025 | 02:16 PM
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I had the same issue after my LMC 5 install. Brown wire mod did the trick.
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Old Nov 8, 2025 | 11:13 PM
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Originally Posted by DinoBob
I had the same issue after my LMC 5 install. Brown wire mod did the trick.

This.
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Old Nov 10, 2025 | 12:11 PM
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Did you already perform this procedure per the instructions with the LMC5?


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Old Nov 11, 2025 | 08:24 AM
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Originally Posted by C5 Diag
Well let us know if a new battery fixes it.
got the battery tested and they said it's good health and not borderline bad or anything. I was thinking of swapping out with optima red top regardless. Thoughts?
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Old Nov 11, 2025 | 08:26 AM
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Originally Posted by DinoBob
I had the same issue after my LMC 5 install. Brown wire mod did the trick.
could you help.me out with steps to check/perform this? Had the install done by someone else.
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Old Nov 11, 2025 | 08:55 AM
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Originally Posted by MyNameIsTerry
could you help.me out with steps to check/perform this? Had the install done by someone else.
Did you read post #15? That is from the instructions for your LMC5. Just use the instructions you have. I has pictures, so you just follow the steps.
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Old Nov 11, 2025 | 10:12 AM
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Originally Posted by lucky131969
Did you read post #15? That is from the instructions for your LMC5. Just use the instructions you have. I has pictures, so you just follow the steps.
Yep! I see it now, will give it a go. Image wasnt loading on mobile for some reason.
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Old Nov 11, 2025 | 01:07 PM
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Originally Posted by MyNameIsTerry
got the battery tested and they said it's good health and not borderline bad or anything. I was thinking of swapping out with optima red top regardless. Thoughts?
Just no need. This is not the battery causing your issue. Do the brown wire mod. You’ll thank me.
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