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have your crankshaft position sensor changed. i did buttloads of research on this as it happened to mine several times this past summer. i was living with someone who worked at a Cadillac dealership and got me some diagnostic stuff done for free so i had the battery and alternator tested as well as the gas pump and a couple other things. no one could figure out what was wrong with it. then i came across a posting on the internet saying people with 03 cts had the same problem. one guy said it was a faulty cps and i had it changed. the part was 75 dollars or so and i got free labor (you wont its about an hour and a half labor time job at a dealership) and it has never happened sense. the mechanic said if the cps fails or is faulty the car will automatically shut itself off to try to protect itself.

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Q: Why would a 2003 Cadillac CTS shut off when driving down the road?
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