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4 Reasons Behind P1093 Duramax Error Code And Their Solutions

What does p1093 Duramax mean? It means that the fuel rail pressure is very low.

This error code is set when maximum fuel pressure is required, but the fuel system is not able to obtain it. This problem can happen for the dirty fuel filter, defective fuel injectors, faulty CP3 pumps, and more.

Well, here you will find the reasons and the symptoms as well as practical fixes. So, stay tuned!

P1093 Duramax

CausesSymptoms
Dirty fuel filterGet a Check Engine light
Defective fuel injectorsThe truck might lose power
Faulty CP3 pumpCrank for a half-second
more than normal
Fuel rail pressure sensor issueNo lights coming on during driving
The truck won’t start
P1093 Duramax Table

Now, we will elaborately discuss all the reasons for the p1093 Duramax code and their solutions.

Dirty Fuel Filter

Generally, the p1093 error code shows when the vehicle is performing at its max and not able to keep up with what is ordered. A common rail fuel system operates at 28,000 to 29,000 pounds per square inch and requires to reduce of just 2,200 pounds per square inch to start this error code.

After the pressure reduces, the Duramax runs in limp mode. The most common and typical reason behind this is a dirty fuel filter. A dirty fuel filter can be blocked by dirt. As a result, it will not allow the full flow of fuel in the Duramax engine.

Solution:

To solve this issue, you need to clean the dirty fuel filter. If the problem persists after cleaning the fuel filter, you need to replace the fuel filter.

Defective Fuel Injectors

Sometimes you can get a check engine light on your vehicle. You can also see the p1093 code in this case. After proper checking by a technician, you can find out that the fuel pressure demand was around 23,000 pounds per square inch, and your vehicle was just providing 19,000 pounds per square inch. This problem can happen with defective fuel injectors.

Solution:

In this case, to do the p1093 Duramax fix, you need to replace the defective fuel injectors.

Faulty CP3 pump


At times you can get the 2002 p1093 Duramax error code on your 2002 LB7 Bone Stock truck. You can also see no lights coming on during driving. Your truck can also lose power sometimes or can crank for a half-second more than normal. This problem can happen if your vehicle’s CP3 pump is faulty.

Solution:

To solve this p1093 Duramax lb7 issue, you have to replace the faulty CP3 pump. You also must ensure that you have a lift pump with filtration in your 2002 LB7 Bone Stock truck.

Fuel Rail Pressure Sensor Issue


Sometimes you can face the p1093 Duramax no start issue on your 2005 6.6Duramax 3500 truck. In this case, you will get the p1093 error code and your truck won’t start. This problem can happen if the fuel rail pressure sensor on the passenger side fuel rail is not working correctly. It can also happen if the fuel rail pressure sensor is not receiving the accurate voltage.

Solution:

To solve thisp1093 6.6 Duramax issue, you are required to replace the fuel rail pressure sensor.

Frequently Asked Questions (FAQs)

What is a P1093 code?

The p1093 error code is shown when the fuel rail pressure is low while there is power enrichment. This means there is an issue with the fuel pressure relief valve. It’s a very common issue between diesel engines. It’s a manufacturer’s particular error code, meaning it doesn’t apply to every vehicle made. Instead, it applies just to particular vehicles made, like Isuzu, Chevrolet, BMW, Audi, and Subaru.

What causes a P1093?

There can be a few lists of reasons behind the error code p1093 Duramax diesel. It can be caused by a dirty or clogged fuel filter. You can also see this code for defective fuel injectors and faulty CP3 pumps. In addition, if the fuel rail pressure sensor is not working correctly or it is not receiving the accurate voltage, then the error code p1093 can appear.

How do I fix code P0089?

Finding out the major cause of the P0089 error code is complex enough because several probable reasons exist. However, the most common fixes for the P0089 code are replacement or mending of the faulty or constrained fuel lines, replacing fuel pressure regulators, replacing blocked screens and filters, and replacement of failed fuel pumps.

Final Words


Generally, you can find out the p1093 error code for the Duramax engine between the years 1999 to 2007 classic Chevy 2500 truck with a Duramax motor. Fixing the p1093 Duramax error code can seem challenging. But it can be more difficult if you don’t know the reasons behind this error code.

To remove your difficulties, we have come up with the exact reasons and their fixes of the p1093 error code.

You can see that there are several different causes and symptoms. We are hopeful that after reading this, you can now easily solve it when you get this fault code on your vehicle.

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D Conroy

Meet our senior writer and content manager of Automasterx. He has worked in several mechanical garages and mastered different vehicle diagnoses and parts repair. He never stops until finding out the ultimate solutions for any vehicle fault code. However, ensuring the only solid solutions for each vehicle malfunction is his core part of the duty, alongside analyzing fault codes and signals.

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