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18,000k miles. Our check engine light kept going off, it took them days to diagnosis the converter as the problem. How does the cat go bad on a car this new?
 

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Overheating of the cat converter is usually caused by exhaust containing unburned fuel, forcing the catalyst to work too hard. Your engine needs attention also.
 

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Same happen to my 2018 PacHy at 4800 miles. Let see how long this Cat will last. The shop couldn't find the reason.
 

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There was a recall for a cruise control problem in the spring of 2018 that was known as U73. This recall included faulty software changes to the power control module that could cause an engine synchronization problem resulting in unburned gas entering the catalytic converter. This problem would occur (and only intermittently) when the PacHy transitioned from electric power to hybrid mode. The faulty software was fixed in another recall in the fall of 2018, known as U94. Depending on how much time elapsed between those two recalls and how lucky or unlucky you were, the catalytic converter could have been damaged during that time. The U94 recall was supposed to include an inspection of the catalytic converter but some dealers skipped that part of the instructions.

There may of course also be some other problem that is causing the damage to your catalytic converter, but if so it has not been widely reported.
 

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On the positive side, The catalytic converter and various other emission control parts are covered under the factory emission control system warranty. Chrysler will be taking care of the bill for you.
 
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