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Chevrolet Corvette Electrical Problems

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  • 1991 Vette coupe digital speedo just flashes "SYS" now and again. Big ZERO displayed all the time when I'm driving, will not display your driving speed eng backfires and loosed power and stalls..please help
  • I retrieved trouble code c41 from my 91 Corvette, what does it mean and what failed. The car only idles.
  • Claire@EdmundsClaire@Edmunds Chicago areaPosts: 968
    Hi, 91roadster,

    Have you tried posting your question in the "Edmunds Answers" box on the lower right side of this page? Just enter your question and then click the "Ask" button.

    ClaireS, Host
    Automotive News & Views | Coupes & Convertibles

    Claire

    HOST

  • bolivarbolivar Posts: 2,316
    Here is a link with some more info on the error code. But no help on a solution. Seem to be same car as yours.

    http://forums.corvetteforum.com/c4-tech-performance/2579168-1991-error-codes-c41- -c51.html

    Here's another

    http://www.justanswer.com/chevy/2b4kn-93-corvette-ccm-dtc-c41-indicates-problem-- communication.html

    And another

    http://www.10w40.com/questions/auto-problems-questions/1990-corvette-that-lost

    These all came from a google search for 'c41 error' and 'c41 corvette'.
    Could be a PCM module, a bad wire somewhere in the data communication wiring. Doesn't look like an easy find or fix.
  • starrow68starrow68 Posts: 1,142
    Just for the record, I had several kinds of codes that would recur, but it all turned out to be
    bad grounds. On the C5 there are 13 different ground locations with multiple connection
    points at each, I'm sure it's the same on C4's. Any bad ground will give bad voltage message
    to any system and that will produce a code for that system. Good luck.
  • c2c35c2c35 Posts: 37
    Ok guys help me out please!! I have a 93' 40th Anniversary. It had just spent some time getting a tune up and, was running good. I knew the battery was bad so i bought a new one. At the same time i also noticed that due to the old battery being in worse shape than i had thought the 2 grounds behind the battery plate looked like to snow balls!! Well I cleaned them up the i looked at the condition of the main fuses. They are all original and looking really gooded up. So i changed then out with brand new ones. So getting to the point. I went to start the car and nothing! i have no gauges (no speedo no gas, trip ect) but, i do have light warnings in the warning cluster. Also no crank no start! I have gone thru everything possible double and tripple checked everything (battery, fuse) inside and out. The security light does not flash at all. the remotes do not work. Now my brand new battery is being drained almost daily! I've been told to reset the security system by turning on the key to accessory lock all doors ect give it 15 or so minutes and that'll do it. Nope! Now the lastest i've been told is that replacing the battery may have fried the alternator. Please anyone Help me out with this!! Any advise is great by me!!

    Thank You
    :sick:
  • fedlawmanfedlawman Posts: 3,118
    Did you replace the battery cables?
  • c2c35c2c35 Posts: 37
    edited July 2011
    no but they are both ok. I had popped both centers out and soaked both cable ends in baking soda including the centers. The only issue that i did see was the extreme build up of battery acid on the grounds behind the battery plate. Which i also dowced and scubbed with baking soda and looking like new. I am really thinking the the alternator. what do you think? battery dieing, no power on my dash, no crank and, no run. By the way if it was the alternator would a fuse blow before if there may have been a battery or power surge?

    Thanks for getting back to me!! :sick:
  • fedlawmanfedlawman Posts: 3,118
    I don't know how replacing a battery can damage the alternator, but it may very well be that the alternator is dead from natural causes (they don't last forever). You should have the alternator checked and replace it if necessary.

    Still, I am suspicious of all the build up you found on the battery and cable terminals and the fuses(?) too. Cleaning the ends that are visible is no indication that corrosion/damage didn't travel up the cables. A change in cable resistance (due to corrosion) could easily explain your troubles.

    I'm not a mechanic - just my opinion.
  • c2c35c2c35 Posts: 37
    i totally appreciate your input!! I went back in today and inspected everything once again. after another couple hours of checking and rechecking the wires themselves i did finally see a lil gremlin staring rite back at me!! A lil mouse sitting rite there on the lower engine support! I really hope the lil gremlin didn't sink his lil teeth into any of my wires underneath! Well how about relays? Do you think that with a power surge maybe 1 or 2 relays may have been blown? 2nd question where are they located!!! as you can see i'm starting to get burned out from looking at wires!!! eeesshh i wish it is that simple to be relays! :confuse: :sick:
  • fedlawmanfedlawman Posts: 3,118
    It sounds like you have some more in-depth inspecting to do...
  • c2c35c2c35 Posts: 37
    yeah tell me about it!! I spent another couple of hours yesterday just trying to find the relay for the starter or actually any other relays other than the ones for the lights! i'll tell ya what when they packed this motor in there, they packed all the wires and hid them real good! Even with the book forget about it! Anyway thanks for all of your input!!
    :confuse: :sick:
  • I had ongoing minor problems with the Climate Controls on an 89 convertible. They would start flashing all buttons and stop working. Turning it off and back on would get it back on track. I also had horrible radio static problems. I traded the car before it quit completely. (Sorry if the person that bought it is reading this!)

    And according to my dealer, wait until you try and check or change spark plugs!
  • c2c35c2c35 Posts: 37
    well 2moro is the big day!! i tried everything i cld think of and, well nothing! i'm really thinking it cld end up being the passive security system but, as luck has it now the brand new battery is totally dead!!!! good thing there's a warranty on it! Well i will be watching my baby being loaded on a flat bed and shipped back to the shop! All of you vette owners no just the flatbed know can make ya cringe! let alone w/ all the electrical problems my check book will be on fire! So fellas wish me luck and cross yur fingers that it's something simple for me here!!

    I'll give updates when i can.
    :sick:
  • Claire@EdmundsClaire@Edmunds Chicago areaPosts: 968
    Keep us posted, c2!

    ClaireS, Host
    Automotive News & Views | Coupes & Convertibles

    Claire

    HOST

  • c2c35c2c35 Posts: 37
    Well it figures that i get the call from my mechanic Monday morning. I guess he needed a break over the weekend and took the weekend off and he had a line of everyday cars needed to be fixed! I stopped in and yeah he wasn't kidding!! He told me well it could be either nice n safe in your garage or i could tow it to the shop leave it outside and park it under a tree in a unsecured lot. well that was a no brainier!!! He did tell me that he is gonna go ol' school on her. Gotta get the tester out and go through everything. god i really hope it's just a fuse-able link or something real simple. cause if its the ecm that's a like 400 buck part!! anyway wednesday now he's supposed to pick her up. so yes i will keep ya's updated on my black beauty! it's like my 3rd kid. I have my daughter my vette and my 2010 Taurus! eeessshh! I think being a car nut is a disease!!!! It's scary cause my 9 yr old has it too!!!! lol! :) :sick:
  • wghebwgheb Posts: 1
    when I connect my battery sparks fly big time, everything is "off " .starts ok , charges ok can't figure out short or where to start
  • c2c35c2c35 Posts: 37
    where is it sparking from? Right from the battery? If so the battery connectors may have build up inside the plastic casing. You need a flat head screw driver and a channel lock wrench to pry out the screw connectors. Even just enough to look inside to see if you have to much build up. Get a cup of water and baking soda and soak both of the connectors also, i'm thinking your vette is around my yr of 93' behind the battery plate there are two grounds. check them also mine looked like two snow balls!! use the baking soda and water and a brush it'll all come off. I hope this works.
    c2c27
  • c2c35c2c35 Posts: 37
    just an update on my black 93' 40Th. well i did find a good Chevy garage. last Thursday. She just went up on the big lift this afternoon to get the starter checked out and, any other wires underneath. I hope to have her back soon! I have a feeling with a very thinner wallet! lol! I will post the findings on here when I get em.
  • c2c35c2c35 Posts: 37
    Well I know it's been a while now since my last update about my 93'. Well the 1st garage i brought it to the guy was full of crap! he had/has no idea about electrical work!!! So my car sat for about 2 weeks or so! It was left outside, looks terrible! and, he just took apart under the dash. Yup that's about it! So i called a TRUE Corvette shop. This guy has over 30 yrs working on vettes! So she is in good hands at least. Unfortunately he found more damage. There is such a huge mouse nest under the dash which surrounds the main computer in the dash. Don't know yet if it is the module or if just 1 or more wires on the out going may have been chewed or the main computer may have been fried by those little bastards and so was my radio!!!!! Unbelievable!!! Well when she's all done i'll be sure to letcha know how she is. :sick:
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