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Summary
  • Diagnostic trouble code (DTC) P2291 stands for “Injector Control Pressure Too Low – Engine Cranking.”  The P2291 code is typically logged in high-pressure diesel injection systems when the powertrain control module (PCM) notes that the injector control pressure is too low.
  • The P2291 code is commonly caused by a very low engine oil level or a problem with the lubrication system, a faulty high-pressure oil pump, or a bad pressure sensor.
  • Some common symptoms of the P2291 code include an illuminated check engine light and the engine failing to start or stalling while running.

A pressure sensor keeps track of the pressure level in the high-pressure fuel injection system. It sends the information to the powertrain control module (PCM), which also monitors fuel pressure while the engine is cranking.

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If the PCM determines that the injector pressure is too low while the engine is cranking, its diagnostics could log a P2291 code.

What Does the P2291 Code Mean?

Diagnostic trouble code (DTC) P2291 stands for “Injector Control Pressure Too Low – Engine Cranking.”

The P2291 code is usually logged in high-pressure diesel injection systems, but it can also apply to vehicles that have gasoline direct fuel injection.

engine fuel injection nozzle focused
The P2291 code is usually logged in high-pressure diesel injection systems, but it can also apply to vehicles that have gasoline direct fuel injection.

The PCM monitors the vehicle’s high-pressure fuel injection system. It looks out for excessively high or low injector control pressure that can damage the engine.

If the pressure sensor indicates that the injector control pressure is too low, the computer will set the powertrain code P2291.

Note: The definition of code P2291 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P2291 Code?

  • Very low engine oil level or a problem with the lubrication system (diesel engines with hydraulic electronic unit injectors only)
  • Faulty high-pressure oil pump
  • Bad pressure sensor
  • Faulty pressure regulator
  • Leaking fuel injectors
  • Circuit problems, such as a damaged wire or poor connection

What are the Common Symptoms of the P2291 Code?

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How to Diagnose the P2291 Code

The P2291 code is a powertrain trouble code that various makes and models can log. However, this does not mean that there is a one-size-fits-all solution to identify its underlying problem.

If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a licensed mechanic. Otherwise, you can go ahead and diagnose the issue yourself. To help you get started, here is a video that can give you an idea of what the process might involve:

How to Fix the P2291 Code

Attempting to fix a P2291 code can be difficult if you don’t have the right tools and automotive knowledge. In most cases, it’s best to leave the job to professionals.

But if you’re confident that you have the technical knowledge to address the P2291 code on your own, make sure you have everything you need before you get started. Consult a vehicle-specific repair manual or refer to an online repair database.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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