17963/P1555/005461

From Ross-Tech Wiki

17963/P1555 - Boost Pressure Control: Upper Limit Exceeded

Possible Symptoms

  • Reduced power output
  • Limp mode

Possible Causes

  • Boost Pressure too High
  • Hoses/Pipes incorrect connected, disconnected, blocked or leaking
  • Charger Pressure Control defective
    • VNT (variable nozzle turbo): nozzles stuck
  • Solenoid Valve for Boost Pressure Control (N75) defective

Possible Solutions

  • Check Hoses/Pipes to/between Components
  • Check Solenoid Valve for Boost Pressure Control (N75)
  • Check / Clean / Replace Charge Pressure Control
    • Check / Clean mechanism for variable nozzles