[freddief73]

I've attached a STAR case (S2014000001) that people will find very helpful when needing to perform this repair. There is a newer revision (dated 8/7/2020) of this same STAR case for the same issue, but the older one is more helpful because it mentions the potential for the P018D (Fuel Pressure Sensor "B" Circuit High) code if the wiring isn't changed as necessary. The information the two documents provide is otherwise identical. Moderators, can we move this thread to the Engine and Technical Discussion section of the forum?

 

[freddief73]

Could someone point me to how I do the fuel system release procedure. Don't want to get fuel everywhere. Also is there a way to put the existing wires into the new plug without soldering or cutting wires?

I don't know what the official procedure is, but I would just start the engine, and pull fuse F43 (Fuel Pump Motor, 20A) while the engine is running. The engine should stall out shortly thereafter within a few seconds when the fuel injectors run out of fuel. Then, turn the ignition OFF and go to work. Don't reinsert the fuse until the work is complete.

Look at the STAR case I attached in post #34 above. It tells you everything you need to know to do the job right with regard to the wiring.

 

[freddief73]

might be my problem which way should they be orientated?

They should only fit in one direction. I still don't think you have it wired correctly. What year is your van? According to the STAR case I posted earlier in this thread, the new pigtail and wiring modification is only necessary for 2017-2018 models.

Did you splice the like-colored wires together when attaching the new pigtail?

 

[freddief73]

A poster on the first page said "Part 52030445AA is no longer available you now need to order 68421782AA and 68137864AC"

52030445AA is still available on the net in a few spots, although I don't know if the order will go through as these places don't have real time inventory. I wonder if you get a hold of 52030445AA do you still need to mess with splicing the wires? What was the "correct" part number your package had? Has anyone managed to track down a 52030445AA and install ok? I have a 2017 pacifica with the P018C

No, the older part number (52030445AA) doesn't require any wiring changes. See post #8 in this thread. However, 52030445AA was discontinued last year and I suspect very little, if any, of the remaining stock is still available.

 

[freddief73]

My wife's van threw the P018D code and has major surging when the accelerator is pressed. The dealership says the fuel pressure sensor is faulty and they want $534 to change it. We bought the car used and thought it would be covered under the basic warranty since it is still under 36k miles but apparently the warranty expired June 6. Also, how is this not covered under powertrain warranty? This failure causes the engine not to run properly, I would consider that powertrain. It seems to be the straw that broke the camel's back for my wife. She wants to trade it in and replace it even though we have only had it a couple months and just put new tires on it. So far, it has had a failed radio, failed DVD player, failed air mixer, we encountered the sliding door failure that may or may not be fixed by a firmware update TSB (that they want to charge $150 to do since it's out of warranty), and now this.

The fuel rail pressure sensor isn't part of the powertrain as defined in the warranty booklet. AFAIK this sensor isn't even used by the PCM for any engine management purpose. It only exists so a tech can see the fuel pressure with a scan tool instead of needing to connect a fuel pressure gauge to the rail. If you're the least bit handy you can easily replace it yourself using the instructions posted earlier in this thread.

My wife's van threw the P018D code and has major surging when the accelerator is pressed. The dealership says the fuel pressure sensor is faulty and they want $534 to change it. We bought the car used and thought it would be covered under the basic warranty since it is still under 36k miles but apparently the warranty expired June 6. Also, how is this not covered under powertrain warranty? This failure causes the engine not to run properly, I would consider that powertrain. It seems to be the straw that broke the camel's back for my wife. She wants to trade it in and replace it even though we have only had it a couple months and just put new tires on it. So far, it has had a failed radio, failed DVD player, failed air mixer, we encountered the sliding door failure that may or may not be fixed by a firmware update TSB (that they want to charge $150 to do since it's out of warranty), and now this.

The fuel rail pressure sensor isn't part of the powertrain as defined in the warranty booklet. AFAIK this sensor isn't even used by the PCM for any engine management purpose. It only exists so a tech can see the fuel pressure with a scan tool instead of needing to connect a fuel pressure gauge to the rail. If you're handy, you can easily replace it yourself using the instructions posted earlier in this thread. You might be able to simply disconnect the sensor and keep driving the van in the meantime if you want to fix it yourself. If your van is a 2017 or 2018, you'll also need to change the wiring connector which is also explained earlier in this thread.

 

[freddief73]

I replaced the sensor and the harness today and now the van runs like it did last week before it broke. If the sensor isn't used by the PCM, why does the STAR case earlier in the thread refer to one of the wires as providing a signal to the PCM and why did the van not run correctly when one of the wires to the sensor broke?

The PCM receives the signal from the the pressure sensor so it can be observed by a scantool, but AFAIK it isn't used for fuel management on the Pacifica. The only thing it would be used for is to regulate fuel flow if the Pacifica uses a variable speed fuel pump (which I'm not sure about - someone with a service manual could verify this). If this is the case and the PCM sees an issue with the pressure sensor (such as a P018C or P018D DTC), it will use a preset pressure instead of the sensor's reading as a failsafe. I can't explain why your van wasn't running correctly, because this usually doesn't cause any noticeable drivability issues. Numerous other owners have had a P018C and/or P018D code, but didn't mention any symptoms aside from the check engine light.