18-012-12 REV. A

Flash: Diagnostic And System Improvements This bulletin involves selectively erasing and reprogramming the Engine Control Module (ECM) with new software. Pickup trucks equipped with a 6.7L Cummins diesel have software improvements/enhancements available for the following DTC's: P049D - EGR CONTROL POSITION EXCEEDED LEARNING LIMIT P0101 - MASS AIR FLOW SENSOR "A" CIRCUIT PERFORMANCE P0191 - FUEL RAIL PRESSURE SENSOR CIRCUIT PERFORMANCE P0471 - EXHAUST PRESSURE SENSOR 1 PERFORMANCE (for cold climate / icing concerns) P1451 - DIESEL PARTICULATE FILTER SYSTEM PERFORMANCE P2000 - NOx ABSORBER EFFICIENCY BELOW THRESHOLD P2002 - DIESEL PARTICULATE FILTER EFFICIENCY BELOW THRESHOLD (for high altitude failures) P2195 - O2 SENSOR 1/1 OUT OF RANGE HIGH P2196 - O2 SENSOR 1/1 OUT OF RANGE LOW P2262 - TURBOCHARGER BOOST PRESSURE NOT DETECTED - MECHANICAL P2270 - O2 SENSOR 1/2 OUT OF RANGE HIGH P2271 - O2 SENSOR 1/2 OUT OF RANGE LOW P241A - O2 SENSOR 1/1 AND 1/2 OXYGEN CONCENTRATION MISMATCH P245B - EGR COOLER BYPASS STATUS LINE INTERMITTENT P2453 - DIESEL PARTICULATE FILTER PRESSURE SENSOR A CIRCUIT PERFORMANCE P2457 - EXHAUST GAS RECIRCULATION COOLING SYSTEM PERFORMANCE P2609 - INTAKE AIR HEATER SYSTEM PERFORMANCEVehicles flashed to address the above codes should be driven and repair validated. If code(s) return, follow diagnostic procedures available in DealerCONNECT/TechCONNECT.Improvements other than DTC robustness or enhancements: Add EMP sensor value on WiTech Improve cruise control functionality Display correct EGR position on WiTech Display correct Crankcase Pressure on WiTech Display Correct alternator voltage in WiTech Corrected CAC Outlet temperature voltage reading Correct for OBD II Readiness for frequent regeneration monitor Improve EVIC message regarding idle shut down (Informs driver of automatic shutdown due to excessive idle time) WiTech turbo hysterisis test revision.