18-053-14 REV. B

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Powertrain Control Module (PCM) with new software. Several software improvements are available for vehicles equipped with a Cummins 6.7L turbo diesel. They are as follows:Prevent Or Reduce Malfunction Indicator Lamp (MIL) Illumination When No Defect is Present For The Following Diagnostic Trouble Codes (DTCs). These Faults Have Been Changed From A One Trip Fault To A Two Trip Fault: P0201 - P0206 - Fuel Injector X Circuit Open Fault Codes. U110E - Lost Ambient Temperature Message. P049D - EGR Control Position Exceeding Learning Limit. P226C - Turgocharger Boost Control ?A? Slow Response.The Following DTC Has Been Changed From A Two Trip Fault To One Trip Fault: U1A24 - Lost Communication With Ammonia Sensor.Improvements To Prevent Or Reduce Malfunction Indicator Lamp (MIL) Illumination When No Defect Is Present For: U3017 - Control Module Timer/Clock Performance P0087 - Fuel Rail Pressure Too Low P2281 - Air Leak Between MAF And Throttle Body P0544 - Exhaust Gas Temperature Sensor Circuit - Sensor 1/1 P0128 - Thermostat Rationality. In cold ambient temperatures P214D - SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration P24A5 - EGR Cooler Bypass Bank 1 Control Stuck P040B - Exhaust Gas Recirculation Temperature Sensor ?A? Circuit Performance U1421 - Implausible Ignition Key Off Time Received P0420 - Catalyst Efficiency Below Threshold P026B - Injection Timing Performance P04DB - Crankcase Ventilation System Disconnected P1C55 - NOx Sensor Intermittent - Bank 1 Sensor 1 P202E - Diesel Exhaust Fluid (DEF) Reductant Injector Performance P20EE - SCR NOx Catalyst Efficiency Below Threshold - Bank 1 P2002 - Diesel Particulate Filter Efficiency Below Threshold P0604 - Internal Control Module RAM P1451 - Diesel Particulate Filter System Performance.Other Updates Included: