DTC P0300 – P0306 is an injector misfire.Check resistance in the injectors to make sure it’s higher than zero ohms but less than one ohm. DTC P0201 – P0206 is the injector control circuit.Check the fuel supply pressure and the condition of the fuel filter. This could be due to the fuel pressure sensor as well as lift pump issues or problems with fuel supply. It indicates a difference between the actual fuel pressure and the set point. DTC P0148 indicates checking the high-pressure common rail.Injection Pumps For 2004.5-2007 5.9L Cummins 24Vĭiagnostic Trouble Codes (DTC) and What To Check.Injection Pumps For 2003-2004 5.9L Cummins 24V.Injection Pumps For 1994-1998 5.9L Cummins 12V.Injection Pumps For 1989-1993 5.9L Cummins 12V.Injector wear can also cause slow deceleration when driving and blue-white smoke when cold at idle. Most cranking and starting issues are caused by low rail pressure. If you crank the engine for 10 seconds and don’t see any smoke coming from the tailpipe, it means that the cylinders are not receiving any fuel. If it’s less than that, it could be due to bad injectors. Check the rail pressure and make sure you have at least 4,000 PSI when cranking. If your engine doesn’t start or is hard to start, it could be due to low or no fuel supply to the high-pressure injection pump. Secondly, make sure that you have clean fuel and good supply pressure. Start by recording and repairing any active DTC as they might be related to the problem.
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This amount of pressure can slice into your skin and cause fuel to enter your bloodstream, which could result in death. Do not attempt to find leaks manually as the fuel system contains pressurized fuel up to 25,000 PSI. In order to diagnose whether your injector pump is failing, you will need a scan tool. Like many long-lasting diesel parts, replacing fuel injectors can be a pretty expensive job. These fuel injectors fail due to mechanical wear and not dirt, so there’s generally no point in trying to clean them if they show signs of failure. The fuel injectors on the Cummins 5.9 engine should last between 120,000 and 150,000 miles depending on the fuel quality and regular filter maintenance. At some point, the engine may also be hard to start or not start at all. The injector pump can’t handle the loss of pressure forever, which means you will eventually start noticing a lack of power in the engine. However, since the lift pump no longer has enough force to do its job, it will eventually wear down the injector pump. The Cummins 5.9 injection pump will continue drawing fuel out from the lift pump. You might not initially realize that the lift pump is broken. In order to check the performance of fuel system parts, you’ll need a scanner.
The fuel is siphoned to the main 5.9 Cummins injection pump, which then sprays it into the engine. One is a lift pump that lifts fuel from the fuel tank. There are two fuel pumps on the 5.9 Cummins. Bad injectors can also cause a knock in the engine. How can you tell when a 5.9 Cummins injector pump replacement is imminent? Some symptoms of 5.9 Cummins injector pump problems include lack of power, not starting, or hard starting.
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