P2291 — Injector Control Pressure Too Low - Engine Cranking

P2291: Injector Control Pressure Too Low - Engine Cranking — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Injector Control Pressure Too Low - Engine Cranking. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The engine may crank longer than usual or fail to start.
  • An engine warning or stalling after startup may also occur.

Possible causes

  • During cranking, inadequate injector-control pressure may involve the applicable pump, pressure regulator or a leak in the pressure circuit.
  • A faulty pressure sensor or damaged wiring can give incorrect pressure feedback.
  • In oil-actuated injection systems, insufficient engine oil or a high-pressure oil problem may contribute.

What to check

  • Read related codes and compare actual injector-control pressure during cranking with the engine-specific target.
  • If injection is oil-actuated, check engine oil level and visible leaks.
  • Inspect the sensor and connections; test pump, pressure regulation or leaks only by the appropriate service procedure.

Also written as: P2291-00, P229100 (some scan tools add the fault-type byte, e.g. -00).