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shocks inoperative,,,maximum speed 80 mph

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Old Sep 3, 2018 | 02:15 PM
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Default shocks inoperative,,,maximum speed 80 mph

I replaced my leaking shocks with aftermarket Bilstein shocks and I'm getting the error that I guess is common when using the aftermarket shocks. How can I get this code to go away as its in "limp node" at a max speed of 80 mph. I have a 2003 50th anniversary corvette. I have searched and keep finding a lot of different people stating a lot of different reasons and it's hard to keep them all straight.
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Old Sep 3, 2018 | 03:32 PM
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I suspect a moderator will send this to C5 Tech. Good luck and welcome to the Corvette Forum!
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Old Sep 3, 2018 | 03:36 PM
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Post your question there for a quicker reply.
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Old Sep 3, 2018 | 03:45 PM
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If you have the F45 or F55 shocks, then you need to get them tuned out of the computer/install resistors to mimic the shocks if you are not replacing them with the same shocks. Do a search using the key words delete F45 or delete F55 shocks and you should get some hits.

Meanwhile, I’m moving this to C5 Tech for more assistance.
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Old Sep 3, 2018 | 03:46 PM
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Welcome to the forum!
Sounds like you had F45 or F55 shocks and went with standard shocks?
Any codes on your DIC?
Try these links: https://www.corvetteforum.com/forums...ed-80-mph.html or https://www.corvetteforum.com/forums...h-problem.html
Best wishes with your fix!
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Old Sep 3, 2018 | 04:17 PM
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Thank you, I will go and get these codes and update. I heard many people mention the Tech II and I am familiar with that machine. Once I have the codes I will reply as well as search for the other items.
Thank You
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Old Sep 3, 2018 | 06:39 PM
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After you find someone with a Tech 2 follow these directions....
1. Hook up Tech 2, turn car on, make sure module in the rear is plugged in. Do not unplug the rear module.
2. Use Tech 2 to delete the F45 option (F55 does not appear on the menu screen, use F45).
3. Save new configuration.
4. Do not turn car off, do not remove Tech 2. Go to the module in the rear of the car, unplug the grey connector (the widest one), leave any other plug(s) in. [leave the other 1 (F45) or 2 (F55) plugged in]
5. Turn off car, leave Tech 2 plugged in.
6. Remove remaining plugs from module in the rear of car. [never plug them back in again, if you do the F45 turns on automatically]
7. Turn car on to verify the "max speed 80 mph" is gone.
8. Unplug Tech 2.

BTW the module is in the left rear cubby. Just pull the cover off it is held on with Velcro, IIRC

Last edited by Smoken1; Sep 3, 2018 at 06:51 PM.
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Old Sep 4, 2018 | 01:51 PM
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Good afternoon, I followed the Diagnostic's and found these codes in the 38-RTD Module.
C0579, C0584, C0599, C0594, and C0691.
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Old Sep 4, 2018 | 02:10 PM
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What state and city are you in? Alot of us have a Tech 2 and could help you out
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Old Sep 4, 2018 | 02:24 PM
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I am located in Orlando, FL
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Old Jun 25, 2021 | 10:05 PM
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Originally Posted by Smoken1
What state and city are you in? Alot of us have a Tech 2 and could help you out
Do you know of anybody in Colorado with a tech 2 code reader they can take care of taking those codes out at 45 at 55
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Old Jul 12, 2021 | 04:50 PM
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Just replaced my 2003 50th Anniversary shocks with 2007 C6 Z06 shocks using a Tech II Analyzer to deactivate the F55 suspension. Purchased shocks from "Summit Racing" and had my buddy (who owns a garage) delete the functionality.

Search Corvette Forum for the following thread...it contains the detailed procedure.

"F45/F55 delete, 5 minutes and $25.00"

Never had a better ride!
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Old Oct 13, 2023 | 01:55 PM
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Originally Posted by Smoken1
What state and city are you in? Alot of us have a Tech 2 and could help you out
I live in Kansas City Missouri who has one here I can go to
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Old Oct 13, 2023 | 02:02 PM
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Originally Posted by Smoken1
What state and city are you in? Alot of us have a Tech 2 and could help you out
I live in Kansas City Missouri who has one here I can go to
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