Sys flashing
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6th Gear
Joined: Aug 2025
Posts: 6
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Sys flashing
Hey guys 👋🏻 new to the forum here. Just have some questions regarding my corvette. If any technicians are willing to shoot a few pointers my way I’d appreciate it. I currently have a 95 Chevy corvette that was mechanically sound and running before I did a heat core swap. Now I got my sys flashing on the dash and will turn on but only run for no longer then 5 seconds.
I must admit the install wasn’t perfect and messed up once by swapping the only two interchangeable connectors. I knew something was up when I first gave the car power because none of the interior lights were on. So swapping the two back I have correct power but now I think something is burnt out. Or my VATS system is active. My next step was diagnosing it so I pulled up the codes and I have an H41 or C41 which is the same thing right, just current? Any help will be gratefully appreciated!
I must admit the install wasn’t perfect and messed up once by swapping the only two interchangeable connectors. I knew something was up when I first gave the car power because none of the interior lights were on. So swapping the two back I have correct power but now I think something is burnt out. Or my VATS system is active. My next step was diagnosing it so I pulled up the codes and I have an H41 or C41 which is the same thing right, just current? Any help will be gratefully appreciated!
Drifting
Joined: Nov 2018
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From: Mays Landing, NJ
Thread Starter
6th Gear
Joined: Aug 2025
Posts: 6
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Last question, since the car has been sitting for like 6+ months what fuel stabilizer do you recommend?
Thread Starter
6th Gear
Joined: Aug 2025
Posts: 6
Likes: 0
The smoking-gun sign of a problem with the bypass is if the SECURITY light is solid-ON when the key is in RUN. (Not flashing with the door open, and the key OFF.) It should also set Code 51 in Module 1. I don't think you have a bypass problem.
I read your opening post. You swapped a couple of connectors. I would go back and double-check that all the connectors are in their correct positions. Check wire colors on each side. They generally match.
If you can, take some pictures of the connectors that were connected 'wrong' (even if they're 'right' now) showing the wire colors on both sides, particularly any tan wires. I have FSM for 1995, I'll take a look and try to determine if anything bad could have happened during the mix-up.
NOTE: Reading the Code 41 trouble-shooting chart they test for both "short to ground" and "short to voltage" on circuit 800, but in no case anywhere on the chart do they stipulate "replace ECM / PCM or CCM." So it doesn't look like anything gets damaged by a short to ground or voltage on cir 800. You probably still have an open circuit somewhere on the tan wire cir 800. Recheck the connectors that were disturbed during the heater core work.
I read your opening post. You swapped a couple of connectors. I would go back and double-check that all the connectors are in their correct positions. Check wire colors on each side. They generally match.
If you can, take some pictures of the connectors that were connected 'wrong' (even if they're 'right' now) showing the wire colors on both sides, particularly any tan wires. I have FSM for 1995, I'll take a look and try to determine if anything bad could have happened during the mix-up.
NOTE: Reading the Code 41 trouble-shooting chart they test for both "short to ground" and "short to voltage" on circuit 800, but in no case anywhere on the chart do they stipulate "replace ECM / PCM or CCM." So it doesn't look like anything gets damaged by a short to ground or voltage on cir 800. You probably still have an open circuit somewhere on the tan wire cir 800. Recheck the connectors that were disturbed during the heater core work.
Okay sweet I was hoping it wasn’t a bypass problem. Yeah most definitely I’ll do a double-check and take some pictures for you and show you the two that I swapped. Also to the best of my knowledge those were the only two that were interchangeable. All the others were direct plug-in play with one another. I’ll certainly check for matching wires on both sides though even tho I feel certain everything is a correct match. You can never be too certain though! 🤙🏼 Thanks for the info man.
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Thread Starter
6th Gear
Joined: Aug 2025
Posts: 6
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Kinda in disbelief but my problem was a lot simplier than anticipated. Taking a third look under at all my wiring I noticed another connector quite similar to another and sure enough the wires weren’t color matched. All I did was swap them and baby fired right up😂 pretty disappointed in myself for making a mistake like that so that's a lesson learned and something I won’t overlook in the future. Thanks anyways guys for the help, it really made me take a harder look at everything. I appreciate the support 🙏