I recently got my first Vette- a 2003 convertible. It’s a Friday / Sunday car for me so I hadn’t thought any of this was urgent, but I have a couple issues going on. I’m hoping someone has seen this combination before.



I have an intermittent code P0410,

My tachometer comes in and out,

And I noticed what I’m pretty sure is a “ground whine” in my sound system.



If I have to put up the top, I just don’t drive the car and I rarely use the stereo, so it took me a while to notice the ground whine.



I had just been resetting the check engine light until I made time to deal with the air pump. Sometimes it goes a long time with no problem, sometimes not long at all. I don’t get the code for either driver or passenger side so it seems like it’s at the actual air pump.



And the dead tach was a rare issue that normally came back alive within five or ten minutes. But now the tach is working less and less, and I noticed its failure seems to correspond with the ground noise in the speakers.



I know these aren’t necessarily connected, but it seems to make sense that a common issue with the ground could be at the heart of this. If the smog pump doesn’t have a good ground wouldn’t that explain the periodic fault?



Any feedback on if I’m all wet? And if not, suggestions on where to start the hunt for the loose ground?



Thanks for any insight.

 

There are numerous threads on here about checking and cleaning grounds on the C5. Also you tube videos. I was having strange gremlins in mine a few years back. Cleaned most of the grounding points, especially the critical ones. Solved my issues and have had no gremlins since. Good livingston

 

This sticky thread discusses cleaning the grounds.

 

That’s super useful information, which seems to be the norm around here.

Looks like I have a series of 20-minute projects ahead.

Cheers!