18-074-25

Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P1C54-00 - SCR NOX Catalyst Missing.
• P056E-00 - Cold Start Turbocharger/Supercharger Boost Control "A" Performance.
• P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation.
• P1451-00 - Diesel Particulate Filter System Performance.
• P0234-00 - Turbocharger Overboost Condition.
• P20E8-00 - Reductant Pressure Too Low.
• P208B-00 - Reductant Pump 1 Control Performance. Customers may also comment on one or more of the following:
• Unable to engage Power Take-Off (PTO) in mobile condition while the vehicle is moving, but has no issue engaging PTO while the vehicle is stationary.
• Engine stalls under high PTO loads at high altitudes.
• PTO does not work during the split-shaft mode.
• Engine/Cab shake during engine shutdown.
• PTO light not blinking when PTO disengaged.
• Poor engine starting performance.
• Diesel Exhaust Fluid (DEF) level gauge fluctuations.
• In cold conditions the engine automatically increases idle speed when in Park to help with warm-up. Once warmed up, it returns to normal idle speed. If the engine is cycling in and out of this elevated idle speed condition, the customer could complain that its not behaving properly.
• Poor alternator charging and battery life This bulletin involves reprogramming the PCM with the latest available software.