Growling Noise From Engine at Low Speeds on Chrysler 300M

An under-tensioned alternator drive belt may cause a growling noise in the engine area at low speeds (usually when accelerating from a stop). This is often mistaken for catalytic converter failure.

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Average mileage: 139,333 (98,000–161,000)
Engine affected: 3.5L V6
6 model years affected: 1999, 2000, 2001, 2002, more2003, 2004
10 people reported this problem
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problem details
2003 Chrysler 300M - 3.5L V6 98,000 mi,
when my car speed reaches 40mph it sounds like its in neutral.
2000 Chrysler 300M - 3.5L V6 161,000 mi,
at low speed grinding noise heard