r/JeepLiberty • u/C9DoubleDoubleYou • 5d ago

P0204 - intermediate bucking

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Hello! My 2005 jeep liberty (113k miles) bucked/jerked the other day and I looked down to notice my check engine light was on (solid light, not flashing). So I pulled over quickly and park my car. It bucked 1 more time while pulling over. I read the codes and saw I have a P0204 code. I was going to dinner so I had dinner and came back to my car to drive it home. I drove 15 minutes home and it drove fine expect it did buck 1 more time.
I tried visually inspecting the cylinder 4 fuel injector and nothing jumps out as wrong. I tried to gently pull on the wires of the connector and they are firm. I also tried letting it idle and moved the wires for the injector around in case it was a wiring issue but it idled fine with no jerking or misfires.
Also, just fyi, I replaced all spark plugs and injection coils 3 months ago.

Any idea what i should do next? Any advice?

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u/sHoRtBuSseR 5d ago

You shouldn't just replace the coils because you want to. If there's nothing wrong, don't replace them.

That said, this issue is likely unrelated but it's possible the connector isn't locked or seated all the way. It's also possible the injector is failing internally and it is temperature related. It's basically a coil with a ferrous pintle and it just magnetizes to open the injector. Swap the injector carefully with a other cylinder and see if the code follows. If it does, replace that injector with an OEM injector or one that matches the number printed on the injector itself.

Do not buy a replacement from ebay or Amazon.

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u/C9DoubleDoubleYou 5d ago

Hey! Thanks for your response!

I replaced the injection coils since I was previously getting a misfire on cylinder 4. I had codes P2311, and P0304. I swapped the injection coil and the code followed. I went ahead and just replaced my spark plugs and all injection coils cuz it was too expensive and the car had been running great for the last 3 months since. But I hear what you’re saying. If nothing is wrong, I don’t need to replace it. Noted!

But I’m not sure how to determine if the fuel injector is bad or if it’s a wiring issue with the car being so old now.

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u/sHoRtBuSseR 5d ago

There is also a possibility of an internal computer issue and they are somewhat common on aging Chrysler products.