P0353-09
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Racer
Joined: May 2021
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P0353-09
No service light lit on the dash and the car seems to run fine although I will comment that occasionally I hear a little ping and I can feel it retards the timing. When using the in-dash diagnostics this code doesn't come up on the screen in the car. In fact I don't have any codes for anything engine related in the car at all. I got this code coming up when I did a scan using x tool. What do I make of it?
Extra history: I had a p0354 code a while back and the only thing that resolved it was running a jumper wire around the wiring harness effectively replacing the one wire that goes to the coil. How is it possible that the wires are failing in the wiring harness somewhere like this? Makes no sense. Is there a common rub point or a common problem I'm not aware of that a 200,000 Mile Corvette would have?
Extra history: I had a p0354 code a while back and the only thing that resolved it was running a jumper wire around the wiring harness effectively replacing the one wire that goes to the coil. How is it possible that the wires are failing in the wiring harness somewhere like this? Makes no sense. Is there a common rub point or a common problem I'm not aware of that a 200,000 Mile Corvette would have?
Last edited by douglasjre; Aug 28, 2025 at 11:13 PM.
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Joined: Sep 2013
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From: Cape Coral, Florida
It was determined that all this started after you did a clutch change a while back and that the engine harness that runs over the bell housing was not secured correctly and was being pinched and needed to be corrected…there is no way to do this from above…you can do the same short to ground test on the coil control wire and if shorted to ground you can do another overlay from the PCM to the coil pack.
Thread Starter
Racer
Joined: May 2021
Posts: 403
Likes: 64
I had the same problem on cylinder 4 a month after putting in a clutch. I can't find any problems with the wiring harness and now I have the same problem on cylinder 3. I finished the clutch install October 2023. It's about 2 years later now and cyl3 is starting to have poor signal from pcm. I wish I could pinpoint exactly where this problem is happening in the wiring harness and exactly why. I don't see any pinches
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,561
Likes: 4,030
From: Cape Coral, Florida
You’ll have to follow the harness from the PCM to the coil pack…I’m sure you’ll find a chaffed wire at a “point of contact”.
Last edited by C5 Diag; Aug 30, 2025 at 09:52 AM.
