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

ECM issues?

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Old May 22, 2026 | 07:43 PM
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emileefh01's Avatar
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Default ECM issues?

My husband and I have a 1993 40th Anniversary edition corvette. When we bought it in October whoever had it before us never put the ECM bracket back on so we don’t have it and haven’t gotten around to trying to replace it. We had it running one morning and in a rush closed the hood on the ECM.

We sent it off to be repaired and just got it back yesterday. Everything else on the car looked as good as it has since we bought it so we plugged it back in and still nothing.

we have no power to anything!
we Just replaced the optispark in October and have replaced most of the other issues on the car.
just trying to get some insight on what to try next.

codes coming up on the dash
C41, H25, H41, H72, H74
module 4 & 9 are saying Error
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Old May 25, 2026 | 08:46 PM
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I think H code is the history code. Clear them and pull the new codes again
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Old May 30, 2026 | 04:49 PM
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Find a corvette shop in your area these 93 are testy . I have had one since new and have the service manual and these cars are not for back yard mechanics and any old garage. As far as bracket they are out there just have to search.
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