Question about 2003 Cadillac CTS

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2003 cts will not start - 101,000 miles

Started my 2003 cts last night and for the first time I heard a rattling noise coming from under the hood - freaked me out because it was pretty loud. I drove the car home and on the drive home the noise stopped. When back out about 2 hrs later and the car would not start. It turns over - but it will not start. I have 101,000 miles on it. What could be the problem. I also have an extended warranty too.

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It sounds like your alternator let go, therefore your battery is not charging, you will need to investigate further but the rattling would be explained by the alternator mechanically breaking internally and failing to charge the battery resulting in your present situation

Posted on Mar 18, 2009

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Posted on Jan 02, 2017

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There are a number of things that can cause a problem like this.
1) Is the noise louder in drive or reverse.
2) I would start with heat-shields because of your "clank" description. Exhaust manifold, catalytic converter shields and any other you can find under hood or under body.
3) If all is good, check engine and transmission mounts. Make certain none have collapsed, cracked or broken.
4) If all good, remove all accessory drive belts and start engine to see if noise goes away.
That's a lot to start with, so let me know what you find and we will go from there.
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Try checking the heat shields on the exhaust pipe up front under the car. Alot of times they will loosen up, and begin to rattle. You can ither remove them, or try to clamp them.
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