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CEL and P01C5 question

PackMule

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Hey folks,

at 98k mi, I've gotten a CEL and error code P01C5, which the dealer service rep says is a "Fuel Pressure Sensor Circuit Low" error.

Looking back over my service records, at 92k mi, I had a DTC for a Fuel Pressure Sensor, and the mechanic notes state "Replaced fuel lines assembly from lower filter to rear of cylinder heads as sensor is not removable. Found DTC stored. Returned to Customer"

The service manager said that the part was not covered under my 100k warranty, claiming it was part of the emissions system... e.g. fuel lines to the DPF... but then I don't understand the mechanic notes of the fuel line running to the cylinder heads? I challenged that, but he looked my warrantee number up on the computer, which apparently they have in the computer all specific part numbers covered in the warrantee, and it was not covered. So $1198 down the tubes on that one not covered. (I've also had to replace the DPF, and the Def pump and line during this same period... all not covered... about $7k all tolled).

At any rate, my question: Are there more than one fuel sensors in the vehicle (I assume so) and which fuel sensor is the P01C5 referring to? I'm trying to figure out if this is a new problem, possibly covered by my warranty, or a recurring problem that maybe was not fixed fully 6k mi ago? Hopefully not a new problem not covered by my warranty!!

Id ask the dealer service rep, but he's out on vacation, and no one answers the phone at the dealer... they want you to interact with them via text messages.
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DylanM

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Your Jeep has two fuel pressure sensors: a high pressure sensor screwed into the right side engine fuel rail, and a low pressure sensor which is hard mounted in the fuel supply line that runs from the fuel/water separator filter housing up to the engine bay. Your fault code pertains to the latter of the two, which sounds like is the one previously replaced per your description.

There was definitely a miscommunication with the service manager in your previous encounter, as there are no fuel lines going to or from your DPF. Regardless, the low pressure side of the fuel system unfortunately isn't covered by the powertrain warranty.

It is possible this is the same problem as before, and if the time that has passed since the repair was performed isn't too long then hopefully the dealer will warranty that work.

-------------------------------------------
P01C5-00-FUEL PRESSURE SENSOR A CIRCUIT LOW

WHEN MONITORED:
This diagnostic runs continuously when the following conditions are met: ignition on, engine running.

SET CONDITION:
The Powertrain Control Module detects the Low Fuel Pressure Sensor reading has drifted below a calibrated range.

POSSIBLE CAUSES:
LOW FUEL PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO GROUND
LOW FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
LOW FUEL PRESSURE SENSOR
POWERTRAIN CONTROL MODULE (PCM)


DIAGNOSTIC TESTS:
1. READ AND RECORD DTCS - ERASE DTCS AND CHECK FOR DTC TO RETURN
2. ISOLATE AND CHECK THE LOW FUEL PRESSURE SENSOR (K179) PRESSURE SIGNAL 2 CIRCUIT FOR A SHORT TO GROUND
3. ISOLATE AND CHECK THE LOW FUEL PRESSURE SENSOR (F856) SUPPLY CIRCUIT FOR A SHORT TO GROUND
4. REPLACE THE LOW FUEL PRESSURE SENSOR AND RETEST FOR DTCS
5. CHECK RELATED PCM AND COMPONENT CONNECTIONS
 
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PackMule

PackMule

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Thx! I'm thinking the issue might be 5. above...and if so, it might have been the problem $1198 ago. Yes, the dealer has a 3yr warranty on their work, but I don't know how that will play out if they fixed the wrong thing.

Thx again for the info!
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