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Code P0204?

Tiny
TCOERPER
  • MEMBER
  • 2007 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
New engine was installed a couple years ago but this is the first real problem I've had since the new engine was installed.

Started with code P0357. I installed 8 new ignition coils. Code P0357 cleared but then code P0204 (Injector Circuit/Open - Cylinder 4) came on. I'm getting good voltage and resistance within specs at the injector plug,

I installed 8 new fuel injectors but the P0204 code still persists. I feel like I have read every possible fix, every personal story of people having the same code, but they were able to fix by either replacing the injector, finding a wiring issue after checking with meter, or finding a loose connection. I have ruled out every fix given for this code. I'm at a loss and don't want to take it to a shop but I may be out of options. Hoping someone on here can offer any help.

Maybe a dumb question: Would a bad spark plug possibly cause the code?
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Friday, August 11th, 2023 AT 7:56 PM

6 Replies

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
The issue more than likely is the wiring between the PCM (powertrain control module) and the injector in question (#4). Most common location of damaged wiring is at the large square connectors mounted behind the metal bracket on the passenger side firewall (bulkhead) area of the engine compartment. Either a pin was pulled out of the connector, or wire was damaged/broken. 80% of my wire diagnosis have been found with visual inspection.
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Friday, August 11th, 2023 AT 10:33 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Code P0204 for a 2007 Ford F-150 indicates an issue with the fuel injector circuit for cylinder 4. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various aspects of your vehicle's performance and emissions. P0204 specifically points to a problem with the electrical circuit controlling the fuel injector for cylinder 4. So, I would check the injector connector for broken wires or corrosion.

Here is a guide to help check the connections and the engine wiring diagrams so you can see which wires to test:

https://www.2carpros.com/articles/how-to-check-wiring

Also, with the key on check for 12 volts at the red wire for the injector connector. Check out the images (below). Please let us know how it goes.
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Saturday, August 12th, 2023 AT 10:50 AM
Tiny
TCOERPER
  • MEMBER
  • 3 POSTS
Okay, I unplugged the connector from the #4 injector and ran an ohm test. It is bouncing all over the place, From 8 to in the 60s and 70s. All other plugs stay steady at around 12. Thoughts?
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Sunday, August 13th, 2023 AT 12:54 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
The #4 injector sounds bad, I think you have found the problem, let me know after the replacement please.
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Monday, August 14th, 2023 AT 11:36 AM
Tiny
TCOERPER
  • MEMBER
  • 3 POSTS
Okay, again as I said in the previous post. I installed 8 new injectors since I had to remove the railing. It’s the exact same code with the new injector.

But let’s say it wasn’t a new injector. How are you saying it’s a bad injector when I’m getting the crazy readings from the plug that goes into the injector? Meaning the injector is just sitting there with nothing plugged in because that is the connector I’m testing.
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Monday, August 14th, 2023 AT 3:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
I misunderstood, I thought you were testing the injector not the connector, you must unplug the PCM to check the connections, please go over the guide above.
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Tuesday, August 15th, 2023 AT 8:37 AM

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