Question about 2001 GMC Sierra 2500HD

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Error code P0093, no fuel leak, filter changed twice, no particle filter -option on my 2001 gmc sierra duramax diesel. goes into limp mode under regular use and especially when towing 28 ft 5th wheel. have changed most electronic sensors, problems is getting worse. used to only go into limp mode when towing. mileage 300K

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  • Anonymous Mar 30, 2014

    Toyota lucida 1997 stuck in limp mode after changing fuel filter

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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

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Sounds like one of your injectors are failing, the same thing hapened to me, the symptoms of injector failure are shown as fuel leak, its worth letting an injector specialist check it.

Posted on May 13, 2010

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Astra randomly cuts out at lights and engine May be sluggish,randomly code is P0093,FUEL RAIL SENSOR?


This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.
When the computer sets this code it senses a large fuel leak in the high pressure section of the engine. The ECM in a diesel always monitors and controls the fuel pressure from the fuel injector pump to the injectors as long as the engine is running.
To set a code P0093 the ECM must sense a sudden large drop in fuel pressure within the system. This drop in fuel pressure can be internal, external or caused by a faulty sensor signal to the ECM.
When this happens, the ECM sets the code, goes into fail-safe mode which will suspend the fuel injector pump operation and allow one minute to pull over before it shuts the engine down. It will remain in fail-safe mode until the key is off.
The engine may run again but investigate the problem first. This problem will not correct itself or go away. The engine could shut down at any time or speed.
Unlike gasoline engines with fuel injection pressures of 30 to 50 PSI, diesel engine fuel pressure runs up in the Megapascal range, from 4,500 to 30,000 PSI. It takes very high fuel pressure to force fuel into the high compression cylinder of a diesel.
As you progress in diagnosing the problem be always mindful of the fuel pressure when the engine is running. It is ridiculously high! You have a code P0093 stating there is a large fuel leak in the system. Use caution when sticking your nose under the hood of a running engine with this code, or wrenching on the fuel system.
Symptoms Symptoms of a P0093 diagnostic trouble code may include:
  • Code set and malfunction indicator lamp illumination (check engine light)
  • Engine will enter fail-safe mode and shut down within one minute
  • Possible large loss of power above idle
Causes Potential causes for this DTC include:
  • Fuel injector failure
  • Fuel line common rail leak
  • Fuel pressure sensor malfunction
  • Fuel pump or lift pump failure
  • Fuel heater constantly on
  • Fuel temperature sensor failure
  • Leaks at any point in the high pressure circuit
  • Electrical connector corrosion or seating problems
  • Fuel pressure regulator malfunction
  • Fuel filter plugged dropping the fuel line volume
  • Injector pump leak
  • Fuel control actuator failure
  • Cascade overflow valve malfunction
  • Short in the electrical harness at the injectors or to the ECM
  • Fuel pressure limiting valve
  • ECM failure
Diagnostic Steps & Possible Solutions
  • Start with the engine off and doing a walkaround inspection for obvious fuel leaks between the fuel tank and the engine.
  • Lift the hood and check the oil and level. If the oil level has risen, smell the oil. If it is heavily contaminated by fuel, an injector most likely failed in the open position. Do not start the engine again until the oil and filter is changed.
  • Look under the hood for leaks. Start at the injector pump and follow the fuel lines to the fuel injector rail. Look at the injectors for signs of leaks.
  • Pull the electrical connector off the fuel pressure sensor and look for fuel in the connector. A failed sensor will allow fuel up through the sensor into the connector.
  • Check when you last changed the fuel filter. A plugged fuel filter will drop the volume enough to set the code.
  • Check all electrical connectors on the sensors and wiring harness to the injectors for missing insulation, corrosion or loose connections. If no obvious leaks have been found, go online and look up the TSBs (technical service bulletins) for your year and make vehicle. Diesels have no lack of problems as the TSBs will indicate.
Look for the code and associated repair procedures and probable causes. Chevy and Dodge reads like a book. The TSBs will include recalls on various items as well.
Look at your warranty. Most diesel engines have long warranty periods for various items. Many cover injectors for 7 years or better and 200,000 miles.
The dealer is the next step if no deficiencies are found. Checking the fuel pressure and the operation of the ECM takes special tools for a diagnosis.
Tip: Diesels outlast a normal gasoline powered engine when properly serviced. But they demand service at specific intervals to operate properly. There is no free lunch with these. Do not use any seals or gaskets that are not OEM. The pressures and temperatures call for the use of certain materials resistant to these temperatures and pressures.

Jul 12, 2016 | Opel Astra Cars & Trucks

1 Answer

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.

Jul 27, 2014 | 2001 GMC Sierra 2500HD

3 Answers

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.

Jun 21, 2012 | 2001 Chevrolet Silverado 2500HD

2 Answers

I have a 2006 GMC W4500 Diesle and these are the read codes (mode 3) that I recieve when it is hooked up P 0087 fuel pressure to low P 0093 fuel system leek detected / large P 0302 Cylinder 2...


Have you serviced the fuel filter/water/seperator/heater? P0093 could also refer to the possibility you filled the truck up with fuel when it was running setting that code. The code for fuel pressure is derived at the rail delivery on a Duramax, again check the fuel filter, or there is a obvious leak somewhere. Hard to tell without looking at it, but start there. Is fuel cap sealing, look at O ring in cap make sure it is not degraded or missing. Other than that could be pump (delivery) for fuel, costly. Look for wetness from the tank, lines, pump, etc...

Oct 22, 2010 | GMC Sierra 3500HD Cars & Trucks

1 Answer

2001 gmc 6.6 diesel 2500hd,the problem wont rev


safety[ limp] mode truck wont go over 2000 rmp but it will get u safely off road or to a service station or home ur getting some kind of code thats effecting ur truck --use a different reader urs might not be able to retrieve the problem code but can reset the computer-some auto stores such as auto zone / advanced auto scan for free check shops in ur local area

Feb 07, 2010 | 2001 GMC Sierra 2500HD

1 Answer

Added a bottle of diesel kleen to prevent smoking on 03 duramax, shortly after truck went into limp mode, i have changed fuel filter twice and it clears for about 2 minutes and then goes back into limp...


try to remove filter and pump out fuel from the tank. the gunk you loosened with "mechanic in a bottle" goes to filter then when ENGINE IS SHUT OFF GUNK SETTLES BACK IN LINE. NEED TO PUMP IT OUT TO SOLVE PROBLEM

Nov 26, 2009 | GMC Sierra 2500HD Cars & Trucks

2 Answers

Added a bottle of diesel kleen to prevent smoking on 03 duramax, shortly after truck went into limp mode, i have changed fuel filter twice and it clears for about 2 minutes and then goes back into limp...


You need to have the codes checked. The injectors in your engine have an issue where they either bypass fuel back to the tank or crack the body and fuel goes into the oil pan.

The warranty period goes to 200k miles, sorry I don't remember how many years, I think it was 7 years.

If you had a smoke problem before you used the kleaner you already have an injector problem.

Nov 26, 2009 | 2003 GMC Sierra

1 Answer

2001 GMC truck Sierra (2500 diesal) trouble code showing T0093. He is driving now. He can clear it and the truck is ok for a bit, then it comes back. Is it ok to keep clearing it and driving? Do you know...


The code should be p0093. It is for an injector(s) problem. It usually means that there is a problem with the injectors where the fuel is leaking internally back to the fuel tank or into the oil pan. The injectors had a warranty of 200,000 miles or 7 years for this problem. Unfortunately you are over by years.

Oct 10, 2009 | 2001 GMC Sierra 2500HD

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