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.
* 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:
* Urea system cali
