LI09.40-N-079144

Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner:
• P300A6D The boost pressure is too low. Charge Air Cooler.
• P300974 Component 'Boost pressure positioner' has a malfunction. The boost pressure is too low.
• P300DFB Component 'Boost pressure positioner' has a malfunction.
• P300DE8 Boost pressure control A has a malfunction after the cold start. Cause The potential causes for these fault codes are: A. Leak or Blockage in the Intake or Charge Air System: This can prevent the proper flow of air, affecting the boost pressure. B. Insufficient Source Vacuum, Vacuum Leak, or Sticking/Weak Vacuum Component: These issues can prevent the boost pressure positioner from functioning correctly.
• For Model Year 2023-Cuurent vehicles operating at approximately 4,000 ft elevation or above, reduced ambient pressure and/or high brake demand may contribute to reduced available vacuum differential and under boost com-plaints, even when no discrete vacuum component failure is identified. C. Internal Malfunction of the Boost Pressure Positioner: The component itself may be faulty. D. Internal Defect with the Variable Turbine Geometry (VTG) System inside the Turbocharger: Issues within the turbo-charger can affect boost pressure control. Remedy A. Leak or Blockage in the Intake or Charge Air System 1. Perform a Pressurized Smoke Test:
•Conduct a smoke test on the intake, the charge air system, and the exhaust to identify any leaks.