Long story real short: My dad was pulling a hill with the **** trailor and the CEL came on. I got it home and it turns out i have a 0148 and an 0251. His predaor was on 100. What caused the 0251? Did he pop the RV, if so where is it and can i reset it? If it was because of rail pressure would a dual feed line fix the problem? I have not pulled the dip stick yet but i will by tomorrow. I doubt anything else is wrong because the truck still runs good and has no hiccups.

He will have a quadzilla commander to monitor all of this stuff in about 4 weeks. I told him not to run it but o well. That is classified under NMP.

 

**** trailer

 

The code 0251 has something to do with the engine shutoff malfunction.
I would have the dealer check it out.
Better safe than sorry.

 

So it does not have something to do with the rail pressure? The light came on as he was climbing the hill.

 

How many ***** do you have Must be a bunch if they have thier own trailer

 

Im sorry the devil made me do it. I hope you figgure it out soon

 

I'm thinking bad fuel pump...does it have a FP gauge??

 

Not yet i will have gauges for it in probably about 2 weeks. The light went out today probably becauyse of the starts. I did notice that as i shift there is a weirds noise at about 2500 from the engine and with the pred on 100 it does not seem to pull like it used to.

 

http://www.canobd2.com/support/DTC_lookup.asp

 

Okay thanks for the help but i know what the code is. What i dont know is what could have thrown it, what to check for, where to start and what all could be involved with it.

 

Sorry, no help there.

 

P0251-CP3 PUMP REGULATOR CONTROL

WHEN MONITORED
When the ignition is on.

SET CONDITION
The ECM detects a discrepancy between the PWM supplied to the Electronic Fuel Control Actuator and the PWM returned from the Electronic Fuel Control Actuator.

POSSIBLE CAUSES

• Fuel pump
• (K181) Fuel control actuator driver open
• (K31) Return circuit open from FCA to ECM
• (K181) Fuel control actuator driver circuit shorted to external voltage
• (K31) Fuel control actuator return circuit shorted to external voltage
• (K31) FCA return circuit shorted to (K181) FCA driver circuit
• (K181) Fuel control actuator driver circuit shorted to ground
• (K181) Fuel control actuator driver circuit shorted to another circuit
• (K31) Fuel control actuator return circuit shorted to another circuit
• Intermittent condition
• ECM

P0148-HIGH PRESSURE COMMON RAIL (HPCR) CHECKSUM

WHEN MONITORED
While the engine is running.

SET CONDITION
A deviation between the fuel pressure set point and the actual fuel pressure.

POSSIBLE CAUSES

• Others DTC's present
• Fuel leaks
• Fuel control actuator
• Fuel pressure sensor
• Cascade overflow valve
• Check valve damaged or blocked
• Fuel return lines obstruction, damage, or debris.
• Lift pump flow
• Air in fuel system
• Leaking fuel injectors or high pressure connectors
• Pressure limiting valve
• High pressure fuel pump
• Intermittent condition

I would check this first

Ignition on, engine not running.
Disconnect the Fuel Control Actuator (FCA) harness connector.
Connect an incandescent test light across the Fuel Control Actuator driver circuit and the Fuel Control Actuator return circuit at the fuel control actuator harness connector.
Observe the test light.
The ECM will perform a self test of the circuit which should momentarily flash the test light brightly, one time, approximately 20 seconds after being connected.

NOTE:

• Check connectors - Clean/repair as necessary.
• Compare test light brightness to that of a direct connection to the battery.

Q: Did the light flash brightly?

YES: Replace the Fuel Pump.



my guess is fuel pump.....if not that then I say FCA.
good luck

 

Ok being as i know 12v's better where is the fuel pump and fca?

 

what year truck???

 

here is a shot of the FCA....Thanks to "pourindiesel" for the pic I stole it from his thread about his duel fueler