The codes pop up on a Duramax when there’s low fuel rail pressure: P0087 or P1093. Usually, the truck is performing at its maximum and unable to keep up with what’s commanded. The common rail fuel system operates at 28 – 29,000 psi and needs to drop only 2,200 psi to trigger the trouble code.
P0193 is a diagnostic trouble code (DTC) for “Fuel Rail Pressure Sensor Circuit High Input“.
What causes low fuel rail pressure on a Duramax?
Low rail pressure could be caused by a restricted fuel filter, air in the fuel, a bad pressure relief valve, excessive return fuel from the injectors or a worn CP3 pump. The least likely cause would be a fuel rail pressure sensor.
What is code P1093 on Chevy Duramax? – Related Questions
How do you fix fuel rail system pressure too low?
The most common repairs to resolve a P0087 trouble code are:
Confirm the code with an OBD-II scanner, and reset the diagnostic code.
Replace the fuel filter or screen (most common)
Replace damaged or kinked fuel lines.
Replace faulty fuel pressure sensor.
Replace the fuel pump.
How do I know if my fuel rail is clogged?
These Are the Signs That Your Fuel Injectors Are Clogged
Misfiring Engine. If you notice that your engine is sputtering, especially when you accelerate, it’s possible that your fuel injectors are partially clogged.
Rough Idling.
Poor Fuel Economy.
Sporadic RPM Needle.
Dead Engine.
Why would fuel rail pressure be low?
In many cases, low fuel pressure is a simple fix once you have identified the cause. Three of the most common causes of heavy equipment low fuel pressure are a faulty regulator, a fuel pump malfunction or problems with the fuel lines.
Can injectors cause low fuel rail pressure?
Since the injectors are running and spraying fuel into the cylinders to drive the engine, the pressure in the rail will decrease.
What causes fuel rail pressure drop?
What can be the most likely causes for a sudden drop in fuel pressure? For cars, typical causes for low fuel pressure include a dirty fuel filter, weak pump, incorrect tank venting, restricted fuel lines, a clogged pump inlet strainer and faulty electrical control.
What should fuel rail pressure be on Duramax?
For starting a Duramax, you’ll need a minimum of 1,500 psi fuel pressure at the rail while cranking and at idle a minimum of 5,000 psi.
How do I know if my fuel pressure regulator is bad on my Duramax?
The symptoms of a bad regulator usually manifest as a surge when idling, though sometimes the surge can happen at speed while driving. Other symptoms include power loss on acceleration or hard starting. Sometimes it can get bad enough to force the truck into limp mode with a low rail pressure warning.
How do I know if my CP3 pump is weak?
Check rail pressure when the engine is off.It should be zero PSI, plus or minus 500 PSI. Look for low or no supply pressure, supply pump or fuel filter etc. Excess particulates can be a factor during excessive idle time due to injector tips having a build up of carbon due to the cold.
How do I know if my Duramax fuel pump is bad?
The GMC Duramax is a turbo-diesel engine produced by General Motors for pickup trucks, SUVs, and vans.
Signs of a Defective Injection Pump
Difficulty accelerating: The engine requires fuel to function optimally.
Reduced fuel efficiency: Another indication of a defective fuel pump is a reduction in fuel efficiency.
What year Duramax has bad fuel pump?
GM intentionally put a defectively designed CP4 fuel pump in every one of its 2011-2016 Duramax diesel trucks—and, as the court noted today, from mile one it will begin to fail. There is no fix.
What are the signs of a weak fuel pump?
Is My Fuel Pump Going Bad?Here Are 8 Signs It Is!
Fuel Tank Noise. A damaged fuel pump might make a loud, whining sound that you’ll hear from your gas tank.
What are the symptoms of a failing high pressure fuel pump?
Symptoms of a high-pressure fuel pump failure are:
Delayed start of the engine.
Hesitation or sputtering in acceleration between 2000 RPM to 4000 RPM.
High engine temperatures.
Vehicle stalling due to exertion or temperature.
Fuel pressure gauge reading low measurements.
Poor gas mileage.
Can I drive with a faulty high-pressure fuel pump?
Q: Can you drive with a bad fuel pump? A: Because a bad fuel pump could cause unexpected drops in power or even completely shut the vehicle down, we do not recommend driving with the knowledge of a bad fuel pump.
How do you test a high-pressure diesel pump?
To do this, loosen the hose connection on the low-pressure nozzle of the high-pressure pump and clamp the pressure gauge in between. Then the engine should be allowed to run in idling mode. According to the manufacturer, the fuel pressure should be between 4.0 and 7.0 bar.