C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

BCM/CCM problems

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Old Dec 16, 2011 | 10:41 PM
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rogerdoger1993
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Default BCM/CCM problems

Unfortunately my BCM or CCM has to be replaced. And I want to make sure the if I replace it that I can reflect the correct mileage on the new BCM. Is it possible to reflect the correct mileage on the new BCM. And if so how do i reprogram it?
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Old Dec 16, 2011 | 10:54 PM
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Originally Posted by rogerdoger1993
Is it possible to reflect the correct mileage on the new BCM. And if so how do i reprogram it?
IIRC you can't .
Has to be done at a dealership (prevents sellers winding speedo back )
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Old Dec 16, 2011 | 10:57 PM
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Originally Posted by rodj
IIRC you can't .
Has to be done at a dealership (prevents sellers winding speedo back )
Hmmm... well that makes sense. but how do I go about doing that if my old BCM is bad?
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Old Dec 17, 2011 | 04:23 AM
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Mileage can be set on a NEW CCM within the first 100 miles using a Tech1 scan tool loaded with the appropriate software cartridge. Once a CCM/BCM has accumulated 100 miles it becomes locked and cannot be adjusted.
I am told but have not confirmed that the Tech 2 replacement for the Tech 1 cannot make the mileage adjustment, so make sure the dealer has what you need. Tech 1's are considered obsolete by most dealers at this point.
I have a Tech 1 with the necessary software, if all else fails send me a PM and I will try to help.
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Old Dec 17, 2011 | 12:05 PM
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The BCM/CCM not only holds the mileage, but it also has the VIN programmed in. If a car came with the FX3 suspension or Z07 suspension, the FX3 codes are stored in the CCM.

A used BCM could be installed but whatever values are in there cannot be changed unless the unit is sent out for a reman. Most BCM's currently available are reman units. But then it comes back with no data so you are still back having to have the unit programmed.
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