Question Details

I have a 2006 Pontiac Grand Prix 3.8L. I have a code of P0300. But i didn't have any other codes to show up. I also noticed that my Catalytic Converter was glowing red. Noticed Coolant leaking when car sits overnight. Please help.. Why am i not getting a code for the Catalytic Converter?

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MBFanatic  1 year 3 months ago

What's happening is that unburned fuel is going into the catalytic converter. There is nothing wrong with the catalytic converter that's why you are not getting a code for that. You need to figure out why you have P0300 code. Which is a misfire code. It can be a bad coil pack. Fuel issue. Or worst case scenario it can also be a blown head gasket. Which makes me wonder since you mentioned the coolant leak. If I had the car, I would do a compression test. Check fuel pressure. Let us know what you find out.

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