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I have a 2006 Dodge Sprinter 2500 that wont start. Scanned

Customer Question
for codes and had a...
I have a 2006 Dodge Sprinter 2500 that wont start. Scanned for codes and had a P2045 and P2051. Replaced the crankshaft position sensor and now I only have the P2051 but the vehicle still will not start.
Submitted: 2 years ago.Category: Dodge
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Answered in 2 hours by:
8/23/2015
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Robert R
Robert R, ASE Certified Master
Category: Dodge
Satisfied Customers: 4,598
Experience: Dodge Master Certified, Dodge Sprinter Certified
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Hello, welcome and thanks for asking your question. My name is***** a Certified Auto Technician with 27+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.
What is the make and model of the scanner that was used to retrieve codes?
Keep me posted...
Thank you,
Robert
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Customer reply replied 2 years ago
It's a snap-on modus. They are definitely correct codes. P2045 is crankshaft sensor plausibility and P2051 is excessive fuel rail pressure. It appears to me that the pump is bypassing because I have low fuel rail pressure and extreme pressure on the return side.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Have you done anything with the fuel filter yet? Sometimes a bad fuel filter can cause excessive rail pressure codes. IF the fuel filter is older that 20,000 miles, replace it and report back the results...
Another thing that can cause this is a problem where the fuel quantity valve connector gets crossed with the pcv heater connector. Has the engine been out recently or have any recent repairs been performed?
Keep me posted...
Thank you,
Robert
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Customer reply replied 2 years ago
It was driven about 1500 miles after fuel filter was changed. That was from Texas to Delaware. Shut it off and has not restarted since. I replaced the fuel filter and nothing. Same as before. Removed return line from fuel rail and cranked engine. Nothing came out of fuel rail but extreme pressure from pump return.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Can that Snap On modis read the datastream? If so. Try to monitor the fuel rail pressure while cranking. Post back the results and we can go from there... Make sure to crank for at least 15 to 20 seconds and post the maximum fuel rail pressure achieved...
It's normal for there to be little or no return fuel from the fuel rail while cranking. Probably shouldn't be a whole lot from the pump but that depends on the position of the fuel quantity valve. (This changes the amount of fuel available for injection and if faulty can cause issues also).
Post back rail pressure while cranking and we can go from there....
Thank you,
Robert
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Customer reply replied 2 years ago
Fuel pressure is normall at 62.4psi but intermittently will drop to 30.5psi.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago

No, I need rail pressure. The rail pressure MUST reach 2000 psi for the engine to start... You should be able to monitor the rail pressure. There should be a setpoint pressure (requested pressure) and an actual rail pressure signal. The 62 psi is fuel pressure on the low side from the lift pump in the tank to the inlet of the fuel injection pump. If the rail pressure is not going over 100 psi, you may possibly have a failed injection pump.. Post back the results and we can go from there....<img src="http://www.justanswer.com/smileys/smiley20.gif" border="0"/>

Thank you,

Robert

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Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Rail pressure should be able to be monitored with a capable scanner. Let me know if the Modis can do this...
Keep me posted...
Thank you,
Robert
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Customer reply replied 2 years ago
The rail pressure is 62.4psi. Thats what i'm saying, it is extremely low. Commanded is 4700psi.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Ok then since there is little return flow from the fuel rail, I suspect an injection pump failure. The fuel quantity valve itself may have failed or the vanes in the injection pump may be faulty. The pump assembly comes with a Fuel quantity valve but the valve may be able to be purchased separetely in case you want to try that first...
The only other possibility that comes to mind is if one or more injectors are faulty but normally when injectors are bad, we are still usually able to achieve at least 500psi rail pressure...
At this time from your description, I'm leaning towards a faulty injection pump....
Keep me posted and let me know if you have additional questions...
Thank you,
Robert
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Customer reply replied 2 years ago
That's what I'm thinking also
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago

Still doesn't explain the P2051 but stranger things have happened....

Have you tried starting it using ether? If careful, this can be a valuable tool if used very sparingly....

Keep me posted...

Thank you

Robert

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Customer reply replied 2 years ago
Tried with minimal starting fluid but it really didn't make an attempt to start
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Just to make sure, check these two connectors to make sure they are not crossed.. They will reach each others component and if crossed will cause strange starting issues and a no start especially if the ECM activates the PCV heater...

Click Here


Keep me posted...
Thank you,
Robert
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Customer reply replied 2 years ago
That would make sense if they hadn't just driven it from Texas.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Like I stated, stranger things have happened....
I'd double check it just in case. Remember, ECM doesn't always activate the PCV heater and the engine can run with the connectors crossed as long as the ECM doesn't activate the PCV heater. Once the PCV heater activates, it will affect rail pressure as the Fuel quantity valve (Item on right side in pic) can directly control fuel flow in to the fuel rail....
Keep me posted...
Thank you,
Robert
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Customer reply replied 2 years ago
Ok. Thanks. I will let you know what I find.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago
Sounds good. I'll be here...
______________________________________
If you need additional information, don't hesitate to ask, I am happy to help as long as necessary to help solve your concern. Remember, a "Positive" Rating will not close this question, You can post a reply here whenever you want, even after rating my answer!
Thank you!
Robert
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Customer reply replied 2 years ago
Connectors were installed in there proper locations. I'm going to order an injection pump in the morning. It has to be bypassing internally.
Dodge Mechanic: Robert R, ASE Certified Master replied 2 years ago

Sounds like you are on the right track. Keep me posted and let me know if you run into problems during the Injection Pump Replacement....

Thank you,

Robert

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