Flash: 6.7L Diagnostic And System Improvements
This bulletin involves reprogramming the Engine Control Module (ECM) with the latest
available software.
Several software improvements are available for vehicles equipped with a Cummins 6.7L
turbo diesel.
Improvements To Prevent Or Reduce Malfunction Indicator Lamp (MIL) Illumination
When No Defect Is Present For The Following Diagnostic Trouble Codes (DTCs):
? U3017 - Control Module Timer/Clock Performance.
? U1421 - Implausible Ignition Key Off Time Received.
? P2281 - Air Leak Between MAF And Throttle Body.
Other Software Improvements:
? Fuel Filter Minder calibration changes.
? wiTECH Fuel Pressure Override and Fuel System Run Up test improvements.
? EGR system improvement to help prevent freeze up.
? Diesel Exhaust Fluid (DEF) system enhancement during stationary regeneration.
