What the P2291 trouble 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?

Technicians report that the most common cause of this code comes from lack of oil pressure caused by lack of proper maintenance or a low oil level. Other causes include a faulty injector control pressure sensor, a defective high pressure oil injector control regulator, shorted or open wiring in the injector pressure control sensor circuit, and injector pressure control connector failure due to heat

What are the symptoms of the P2291 code?

Engine may not start
Engine may stall

Common mistakes when diagnosing the P2291 code:

Injector control pressure sensor replacement is common but not automatic. Many times an injector control pressure sensor is replaced to correct a low oil pressure condition that has been prolonged too long. If internal high pressure oil pump or engine failure has occurred, due to a low oil level/oil pressure condition, an injector control pressure sensor will appear to rectify the situation for a time but the low injector control pressure condition may return when the engine reaches normal operating temperature.

What repairs can fix the P2291 code?

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