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P0093 code and p1781 plague my 2001 duramax LB7

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Posted on Jan 02, 2017

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SOURCE: I have a 2001 Chevy

Its means there is misfire in the engine cylinder 7 please check the wiring of the spark plug ..................

Good luck...

Posted on Aug 06, 2008

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SOURCE: need a 2002 lb7 duramax firing order diagram

firing order is 12784563 cyl placement is drivers side front to rear 2468 pass side front to rear 1357

Posted on Feb 13, 2010

  • 1868 Answers

SOURCE: error code P0093, no fuel leak, filter changed

Hello! #1; The injection pump inlet hose has been known to kink which will cause this fault...The line is foam covered...#2; Have you changed the Fuel Rail Pressure Regulator?
If so, the connector and its wiring may be open or resistive...The wiring is as follows...Purple White from regulator to ECM pin #42...Yellow from regulator to ECM pin #77...Check with an ohm meter set on X1 scale...Most important is the condition of the FRPR connector...Radio shack has a product called DOXIT...It cleans contacts by merely
spraying...No-touch cleaning...Excellent product...$14.95...Two spray cans (small) one cleans the other protects...Not much is necessary...Also clean the connector for the Fuel Pressure Sensor...Wiring; Tan...Orange/Black...And Yellow,,,

Send a comment with results...Guru...Saailer

Posted on May 13, 2010

  • 1102 Answers

SOURCE: 2001 duramax diesel engine light came on reads

Lots of good reading here:

Posted on Aug 05, 2011

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Where is the fuel pump located on a 2001 gmc 6.6 turbo duramax deisel truck?

Hi Lone Ranger,

The first link offered has information to set you up US Diesel Parts Fuel Pumps Injection Pumps and Injectors GM Duramax LB7 . Now on to the location. Here is a quick feed to watch duramax cp3 pump swap . Lets finish with this gentleman's input and contribution. Duramax cp3 high presure fuel pump removal .

This will provide a look and see distant generalization of what you may be getting into and some live experiences of those who did. Fare. Well.

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My 2002 GMC Duramax LB7 won't start after I shut it off Already replaced the fuel regulator which the code came up Still have to crank and crank before it will start. Runs great once it's going. 160545...

Take vacuum hose off pressure regulator. If it is wet it's defective, Also sounds like fuel pump. Hit bottom of tank with mallet while trying to start.

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most likely a bad injector, you need to check balance rates for the injectors with a scanner. if the rates are farly equal then it is probably a rod bearing but injectors are a common problem that's why they changed the original LB7 duramax(2000-2004) from internal injectors to external so they would be easyer to change.

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this is not a good idea,,, if the glow plugs come on while cranking you will do some serious damage. glow plugs first must not be coming on... you don't mention what year or engine lb7 lly lbz lmm?? fuel management filters ,,lift pump lb7 had external fuel pump..

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Duramax diesel Silverado 2500HD 2001 is throwing code P0093.....Can anyone tell us what to do to fix it?

Very odd. A Google search comes back with lots of "Duramax" hits . The code is: "Fuel System Leak Detected - Large Leak"
Some fixes that I found were replacing the fuel filter, others changed the FPRV (Fuel pump return valve?)
When you're pulling a trailer there is a much greater load (air resistance) even when just cruising. Empty or fully loaded, it's mass won't matter, it's the extra fuel required at every phase of your drive. If the fuel filter is getting clogged, it's possible that some sensor is showing a pressure that is beyond predetermined limits. Try the fuel filter replacement first to see if that fixes it.

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1 Answer

Trouble code p1093 2003 duramax

P1093: Fuel pressure low during power enhancement

Check the oil and see if it smells like diesel. Sounds like an injector stuck open.
The LB7 trucks have injector warranty extended to 200k, so I would think about calling the dealer.

Apr 12, 2010 | 2003 Chevrolet Silverado 2500HD

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