P2291 OBD-II Trouble Code: Injector Control Pressure Too Low - Engine Cranking

Check Engine Light

P2291 Code Definition

Injector Control Pressure Too Low - Engine Cranking

What the P2291 code means

This trouble code will only be found on diesel powered vehicles. It indicates that the injector control pressure for the high pressure oil has fallen below the threshold of acceptance set by the manufacturer during the cranking of the engine.

What are the causes of the P2291 code?

Some potential causes of this trouble code would include:

  • Lack of maintenance resulting in low oil pressure
  • Engine oil leaks causing low oil pressure
  • A faulty injector pressure control sensor
  • A faulty oil injector control regulator
  • Damaged wiring or connectors that are associated with this system.
  • A faulty powertrain control module

What are the symptoms of the P2291 code?

Symptoms of this trouble code that the driver may experience would include:

  • A Check Engine Light may be illuminated

  • If the engine runs with this code stored for an extended period of time, severe engine damage may also be a symptom associated with this trouble code

How does a mechanic diagnose the P2291 code?

A mechanic may begin to diagnose this trouble code by first checking the oil level and condition. If the oil level is low or extremely dirty, this issue may have been caused by that. If the oil seems to be okay, the mechanic would then test the injector pressure control sensor and the oil injector control regulator for proper function using the manufacturer’s recommended procedure. During these tests, the mechanic would also ensure that all the wiring and connectors associated with this system are in good working condition. Finally, the mechanic would test the powertrain control module and relay their findings over to the customer to help make a repair decision.

Common mistakes when diagnosing the P2291 code

A common mistake that could be made when diagnosing this trouble code would be assuming that is not a big deal, and driving the vehicle with the code stored for a period of time. This is not a code that can be put on the back burner as it can cause serious engine damage.

How serious is the P2291 code?

This code would be considered very serious as it can cause major engine damage if stored in the powertrain control module for an extended period of time. It is not a good idea to drive a vehicle with this trouble code stored other than to drive it to a place to get this issue resolved.

What repairs can fix the P2291 code?

Repairs that could potentially resolve this issue would be:

  • Changing the engine oil
  • Repairing an oil leak
  • Replacing the injector pressure control sensor
  • Replacing the oil injector control regulator
  • Repairing or replacing wiring or connectors that are associated with this system
  • Replacing the powertrain control module

Additional comments regarding the P2291 code

Keeping up on basic vehicle maintenance can help to prevent trouble codes such as this one. Each manufacturer of diesel engines will specify an oil change interval that should be strictly followed. This information can be found in your owner’s manual. The typical diesel interval is between five and ten thousand miles.

Need help with a P2291 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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