SM1702

The intent of service memorandum SM1702 is to make Blue Bird dealers aware that Cummins has released a calibration update improvement to reduce occurrence of Allison transmission fault code P2637 ?Torque Management Feedback Signal? with Cummins B6.7 diesel engines. Please reference Cummins Technical Service Bulletin ?TSB170089?. For any engines built before July 1, 2017, an ECM Code change is required to prevent occurrence of engine fault code 3555 ?Engine Wait to Start Lamp - Abnormal Update Rate? after updating (ECM) calibration. Please reference Cummins Technical Service Bulletin ?TSB170081?. Blue Bird advises customers to contact their local Cummins repair facility to have these software updates completed.