Catalytic Convertor Problems of GMC Sierra 1500

The contact owns a 2008 GMC Sierra 1500. The contact stated that after the dealer repaired the vehicle under NHTSA campaign number: 21v050000 (air bags) and gm's emission recall: n140581 (carbon monoxide emissions), the vehicle nearly caught on fire. The contact stated that while driving at an undisclosed speed, the contact turned on the a/c, and the vehicle started shaking abnormally. Additionally, the vehicle made abnormal sounds, jerked, and stalled while driving. The vehicle was taken back to the dealer, and there was smoke coming from under the hood. Upon inspection, the dealer discovered that the catalytic convertor was extremely hot and glowing red. The dealer determined that the exhaust system and catalytic convertor needed to be replaced. The vehicle was then towed to the residence. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was 151,071.

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The contact owns a 2016 GMC Sierra 1500. The contact stated while driving approximately 20 mph, there was an abnormally loud sound coming from the engine. The contact stated that the vehicle would not accelerate above 30 mph. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the catalytic convert needed to be replaced and cylinder #7 misfiring. The contact was informed that the rod bearings needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure however, the contact had not yet received a response. The failure mileage was approximately 113,000.

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My catalytic converters failed once under warranty around 79000 miles and again around 110000. I paid for the second. I am having trouble again at 117000 miles and come to find out the problem is due to a leaking intake manifold gasket. This is allowing coolant to find its way into the exhaust destroying the quite expensive parts.

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