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Engine derates when pulling heavy load code p0093

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This is an error which indicates fuel leak. This can also be caused by blockage in the fuel line. Check first the fuel filter. A faulty fuel pump or fuel injector can also cause this error.

Posted on Sep 20, 2011

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Posted on Jan 02, 2017

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Mitsubishi Fuso 2004 Truck is derating but running well until it derates can derate up to 10 times in an hour but then can run for hours without doing it Any Ideas?


the derating is the vehicle going into limp mode from a reported fault from the engine or transmission
in and out indicates a bad connect in a wire somewhere or loose connection on the ECM unit
possible also that there is venting problem in the tank so check that out as well

Aug 31, 2016 | Mitsubishi Cars & Trucks

1 Answer

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

2 Answers

2005 2KD Hiace, starts lazy,revs good when it starts but accelerator goes dead, check light comes on, then in about 2 minuets the engine dies. 093 code.


fault code is missing a letter and first number
so its P0093 large fuel leak

the fault list has list of what to check
http://www.obd-codes.com/p0093

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
Copyright OBD-Codes.com

Jun 07, 2016 | Toyota Cars & Trucks

1 Answer

Fault code 1 Fail 31 Spn1569 2015 Cascadia Cummins engine


spn 1569 relates engine protection torque derate -condition exists.
critical fault codes related to engine operation are active
code 1 means urgent attention
A sort of limp mode setting that requires immediate attention by a cummins service center to prevent further damage to the engine
go google and type in--- cummins engines fault codes (or cummins engine fault code 1569) and there are pages of pdf downloads that list all the codes and what they stand for

Oct 07, 2015 | Cars & Trucks

1 Answer

Citroen p0093 code


wrong forum do post to Citrone. please.
ill type for you
here ( read them , then ask about what you dont understand)
5000 hits

https://www.google.com/webhp?gws_rd=ssl#q=Citroen+p0093+DTC

May 03, 2014 | Citroen Cars & Trucks

1 Answer

P0093 toyota


I have same problem however, at time, I cannot accerlerate unless I switch off engine and restart again. This mostly happens after my RAV4 has cold engine ( cold in Africa standard ) Been told by CFAO socaoled Toyota dealer but said that injectors must be removed etc. etc..
What is the best thing do ? Is it safe to be driving with this error code?

Nov 09, 2013 | Toyota Cars & Trucks

1 Answer

Solution to Trouble code


P0093 - Fuel System Leak Detected Large Leak

I would have a fuel pressure leak down test run, it may be a failed pressure check valve in the fuel pump inside the fuel tank and the system sees this as a leak. Don't replace any parts until the test is run, the part is very expensive to replace on this make of vehicle.

Sep 05, 2012 | 2006 Toyota Fortuner 3,0

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

1 Answer

Cummins marine engine QSB5.9 derate under load. Come up with fault code 559 ( fuel pump delivery pressure low ). Where do i start to look.Can it be the fuel pump.


well i can be fuel pump or relay to pump,filter,fuel regulator,injectors. does it miss or cut off. make sure gas is tigth

Dec 16, 2010 | 2008 Mercury Mariner

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