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2006 Cadillac STS - Page 6 Questions & Answers
Code p0305
check your pcm module to make sure it functioning right, they usually have a warranty from the factory up to 80,000 miles. Also, check all of your coils, and plugs. If all that checks out you may have the same problem I had with mine at 66,000 miles which is unusual. Which is it may be the timing chain. The dealership said it's strange, but mine was stretched. I haven't had the problem since then. It was the timing chain the entire time which caused the problem
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