How to Fix the P1093 DTC Code on Duramax (Expert Insights)

Duramax is one of the most popular diesel engines and is well-known for its durability, power, and efficiency.  Nevertheless, the stand-out feature of this engine is its pinpoint accuracy in overall fault diagnosis utilizing the DTC (Diagnostic Trouble Codes) like the P1093 code analysis. So, inherently, you will ask yourself, What does code P1093 mean on Duramax?

The P1093 code on Duramax indicates that the engine is having a huge crisis in the motor compartment and is low on fuel. This is a severe issue as it can permanently damage your fuel pump or injector and will ultimately cost the car owner a fortune.

Therefore, in this article, we’ll go over what this code means in-depth and how to fix it so you can drive off the highway as soon as possible.

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What Does P1093 Code Mean On Duramax?

As previously stated, the P1093 code on Duramax refers to the lower fuel bar force during enrichment. Or, in short, the motor lacks the minimum fuel requirement. Here’s an analysis of the P1093 code’s connection to this problem:

P = Powertrain, the system of elements that push your automobile onward (In this case, the engine).

1 = Duramax manufacturer’s developed specific enhanced code number

0 = Fuel, air metering, and auxiliary emission controls

93 = Specific fault index (In this case, it denotes low fuel bar pressure)

The code P1093 is a familiar problem among the diesel engines, generally caused by the fuel pressure relief valve. Normally, a tiny plug behind the driver’s side fuel rail turns scorching hot and ultimately leads to opening up earlier, triggering the code.

How Serious Is P1093 Code On Duramax?

P1093 can be summarized as a “code-red-level” issue that requires immediate attention. The Duramax diesel engine can be seriously damaged by the P1093 code, which reroutes the problem back to the engine’s fuel and air system.

Due to the rise of leftover oils from the diesel residing inside the injector together with oil from intensified force through the injector pump, its stiction is born. Because of it, the oil breaks down at the molecular level, and exposure to the high stressed air, the properties transform into more sluggish in nature.

And this sluggish oil can do some severe harm to many of the engine’s main particles, such as the spool, nozzle, o rings, and even the turbocharger if left untreated. 

So, if the P1093 code is detected, the engine must be replaced as soon as possible to prevent severe damage and save yourself from a hefty repair job fee.

What Causes P1093 Code On Duramax?

The P1093 code’s root cause can vary depending on the specific model of the engine and vehicle of the Duramax brand. Yet, the majority of the vehicles have the exact same standard casualties.  

For instance, some common causes of the P1093 code on Duramax engines include worn or damaged parts, incorrect air/fuel mixture, and poor emissions control.  Here is a list of some other notable causes:-

  • Fuel rails that are damaged or defective sensors
  • The wiring for the fuel injector is shorted
  • Leaking of fuel injectors
  • The fuel system is flooded with water
  • A fuel pump that is damaged or malfunctioning
  • The fuel filter clogged
  • Injectors for fuel that are damaged or broken or injectors
  • Highly dense component of air in the fuel system
  • Fuel injector stiction
  • Computer engine programming that is not working properly

How To Fix P1093 Code On Duramax?

The common fix of this P1093 code can be done by fuel system priming, diesel tank replacement, or the frequent replacing/cleaning up of the fuel injector nozzle or nozzles.  Here we will go through the fuel injector nozzle fix: 

Step 1: Go through all the checklists.

In the initial step, we look to detect the issue with the aid of the P1093 code.

Step 2: Analyze the fuel return sensor.

Be certain if the engine’s fuel compartment is plugged up or not. (Normally, the root issue)

The plugging can be caused by piled-up junk or rusting of old injectors and boggling up near the sensor resulting in not unleashing the full flow.

Step 3: Move the pressure system and cool the block control module.

This is required to release the compressed air and get the bolt returns from each bang around the sensor.

Step 4: Blow compressed air.

We will apply external compressed air to get the junk out inside the sensor in this step.

Step 5: Remove the nozzle head.

Be careful when braising the fuel line while handling the tools, and stay aware of not bending and twisting the nozzle head.

Step 6: Blow the crud out.

This will help to get the sensor up and working.

Step 7: Repeat for other nozzles.

Step 5 and Step 6 should be repeated for the other nozzle head.

Step 8: Check the input and output cooler.

If either cooler (input or output) is not plugged, so the restriction is a particular weighted element (sluggish oil, rust, accordion hose, etc.) that leads to the tank.

Step 9: Pull the weighted element out.

In this final step, we will check everything inside to pull the culprit weighted element out and do some minor modifications to the fuel pick-up to get the engine started.

Other Symptoms Of Getting P1093 Code On Duramax

If any of these other symptoms are occurring on your Duramax diesel truck, there is a good chance you have gotten the P1093 code. Here they are:

  • The exhaust releases white smoke
  • Engine code alert
  • Doesn’t start at all
  • Bumpy idle
  • Bogging down when accelerating
  • Trouble starting your engine
  • No power or poor power
  • Strange Sounds from the engine. (Also known as fuel knock)
  • Poor fuel economy

How Much Does it Cost to Fix Duramax P1093 Code?

Depending on the specific issue, it may also require the installation of new parts or a complete engine overhaul. It can cost anywhere from $75 – $150 per hour to fix a Duramax P1093 code issue.

In some cases, however, a simple repair may be all that is required. If you’re not sure whether or not your Duramax P1093 code is worth fixing, ask your mechanic.

Can You Drive Your Duramax With code P1093?

Yes, you can drive your Duramax with code P1093. However, it is not recommended as your car will quickly run out of fuel.

If the code comes up while driving, you should pull over immediately and turn off your engine to avoid further damage. Letting your truck idle with this code on can cause damage to the catalytic converter and other parts of your fuel system.

You should also contact your mechanic or dealership as soon as possible because these problems can be expensive to fix if they’re not taken care of right away.


In short, code P1093 is a Duramax manufactured code and is considered an OBD-II Code, which means Diagnostic Trouble Code(DTC) indicates the issue of low pressure in the rails.

The causes can be identified by the car not starting at all, rough idle, bogging down during acceleration, and so on.

So, it’s highly advised that you immediately fix it at the nearest vehicle repair shop whenever you detect this code getting active. Because driving a car with a P1093 code can lead to severe damages, costing the vehicle owner a fortune.

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