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C5 No Crank

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Old Apr 4, 2023 | 07:22 PM
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Default C5 No Crank
Hello, I drive a 2003 Corvette Z06 and I’m having some serious issues. A couple days ago, my car suddenly stopped cranking at all. When you turn the key, you can hear electricity humming but no starter click. All accessories work when turned to On position but all turn off when key is turned to Ignition. I’ve already replaced both the battery and starter and nothing has changed. This is extremely frustrating and my friends and I are genuinely losing our minds over this. Please help.
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Old Apr 4, 2023 | 07:42 PM
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Originally Posted by CFL15
Has the ignition switch been replaced? Common problem
No, is that something you can do in a garage or would I need a dealer or specialist? Trying to save as much as possible here
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Old Apr 4, 2023 | 09:41 PM
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Check the TDR?




Clutch switch?
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Old Apr 5, 2023 | 12:27 AM
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Bill Curlee is the man, all no crank troubleshooting should start at the TDR, it is called the Theft Deterant Relay, but it is the starter enable relay.
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Old Apr 5, 2023 | 11:58 AM
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Originally Posted by mmartinez
Bill Curlee is the man, all no crank troubleshooting should start at the TDR, it is called the Theft Deterant Relay, but it is the starter enable relay.
Anybody know what happened to him??
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Old Apr 5, 2023 | 02:22 PM
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Originally Posted by jdmvette
Check the TDR?




Clutch switch?
When we were first trying to diagnose the issue, Clutch Switch was one of my first thoughts since the car actually does the same no-crank issue whether the clutch is depressed or not. Thanks for the image and I'll take a look when I get some time.
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Old Apr 5, 2023 | 02:23 PM
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Thanks for the help, I'll take a look when I get the chance. Cheers! (PS I love the car, wheels look great!)
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Old Apr 5, 2023 | 04:30 PM
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Originally Posted by PaulHDragon
Try turning the key around and/or wiggling it
Thanks for the tip! Unfortunately, I’ve tried virtually every key movement to no avail.
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Old Apr 5, 2023 | 05:26 PM
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Originally Posted by PaulHDragon
Kk I’d it was the ignition switch the car would act completely dead I’d check the starter next clutch switch is possible but very rare
Awesome, I'll get a peek at it when I get a chance. I have a multimeter and whatnot, however, I'm not very well versed in working on cars just yet. How exactly would I check the switches? Is there a guide somewhere? Thanks for all the help.
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Old Apr 5, 2023 | 08:25 PM
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Originally Posted by PaulHDragon
If the car powers up but doesn’t start it’s not the ignition switch. When my ignition switch failed the car acted as if it was dead if focus on the starter
Again, thanks for the tip! My friends and I will take a look tomorrow and see if we can find anything.
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Old Apr 6, 2023 | 12:26 AM
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Did you read the post with the explanation of the starting circuit by Bill Curlee, it will help you determine why your car is not cranking over.
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Old Apr 6, 2023 | 04:19 PM
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Originally Posted by mmartinez
Did you read the post with the explanation of the starting circuit by Bill Curlee, it will help you determine why your car is not cranking over.
Hi, can you link it to me? I hate to be bothersome but I'm having a difficult time finding it. He seems to have a lot of posts.
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Old Apr 6, 2023 | 04:29 PM
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It's on this thread posted by jdmvette, sorry I am not extremely knowledgeable on how to link it to you.
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Old Apr 6, 2023 | 06:00 PM
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From: Bugs Bunny should'a made a left turn here
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Originally Posted by matthewsc5
Hi, can you link it to me? I hate to be bothersome but I'm having a difficult time finding it. He seems to have a lot of posts.

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