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 Unnecessary Malfunction Indicator Lamp (MIL) Illumination For
The Following DTCs. These Faults Have Been Changed From One Trip Faults To
Two Trip Faults:
? 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 Unnecessary Malfunction Indicator Lamp (MIL)
Illumination For:
? 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.
? U3017 - Control Module Timer/Clock 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.
? 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:
? Fuel Filter Minder Calibration Changes
? Cruise control
