GMC Acadia catalytic converter failure requiring towing and repair, reported issue among multiple owners on GMC Acadia

Some GMC Acadia owners report experiencing catalytic converter failure that necessitates towing and repair, particularly in the 2009 model, which has an average repair cost of $650 around 86,050 miles. Symptoms of a clogged catalytic converter include limited performance at higher speeds, irregular engine running, unusual exhaust odors, poor fuel economy, illuminated engine check lights, and sometimes rattling noises. Common causes of this failure include engine misfires, overheating, melted or broken converters, oil-fouled substrates, and structural damage. Owners also note that if the internal structure of the catalytic converter overheats due to fuel system problems or exhaust leaks, it can melt and lead to failure. Additionally, driving with a clogged catalytic converter can generate excessive heat inside the engine, risking damage to other components, so it is advised not to drive the vehicle if catalytic converter issues are suspected.