18-091-16

Flash: Powertrain Diagnostic And System Improvements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the following Diagnostic Trouble Codes (DTCs) have been set. Several software improvements are available for the following conditions. The Following DTC has been changed from a two trip fault to a one trip fault: · U1A24 - Lost Communication With Ammonia Sensor. Prevent or reduce MIL illumination when no defect is present for the following DTCs. These faults have been changed from a one trip fault to a two trip fault: · P0201 - P0206 - Fuel Injector X Circuit/Open. · P049D - EGR Control Position Exceeding Learning Limit. · P0711 - Transmission Temperature Sensor Performance. · P0712 - Transmission Temperature Sensor Low. · P0713 - Transmission Temperature Sensor High. · P0714 - Transmission Temperature Sensor Intermittent. · P0740 - TCC Out Of Range. · P0869 - Line Pressure High. · P0933 - Hydraulic Pressure Sensor Range/Performance. · P0934 - Line Pressure Sensor Circuit Low. · P0935 - Line Pressure Sensor Circuit High. · P1775 - Solenoid Switch Valve Latched In TCC Position. · P1776 - Solenoid Switch Valve Latched In LR Position. · U0100 - Lost Communication With ECM/PCM. · U0002 - CAN C Bus Off performance - Bus Off. Improvements to prevent or reduce MIL illumination when no defect is present for: · **P2281 - Air Leak Between MAF And Throttle Body. · P218F - Reductant No Flow Detected. · P242F - Diesel Particulate Filter Restriction - Ash Accumulation. · P20E8 - (Diesel Exhaust Fluid) Reductant Pressure Too Low. · P202E - Diesel Exhaust Fluid) Reductant Injector Performance. · P209F - Diesel Exhaust Fluid) Reductant Tank Heater Control Circuit Performance. · P218F - Reductant No Flow Detected.**