Flash: 6.7L Diagnostic and System Improvements
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
Several software improvements are available for vehicles equipped with a Cummins 6.7L turbo Diesel.
Prevent Or Reduce Unnecessary Malfunction Indicator Lamp (MIL) Illumination For The Following Diagnostic Trouble Codes (DTCs). These Faults Are Currently Tripped As A One Trip Fault And Should Have Been 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.
* U110E - Lost Ambient Temperature Message.
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:
* P026B - Injection Timing Performance.
* P0128 - Thermostat Rationality. In cold ambient temperatures.
* P0087 - Fuel Rail Pressure Too Low.
* P2281 - Air Leak Between MAF and Throttle Body.
* U3017 - Control Module Timer/Clock Performance.
* U1421 - Implausible Ignition Key Off Time Received.
* P026A - Charge Air Cooler Efficiency Below Threshold.
* P04DB - Crankcase Ventilation System Disconnected.
* P0544 - Exhaust Gas Temperature Sensor Circuit - Bank 1 Sensor
