This bulletin applies to 2013-2014 RAM 2500, 3500, 4500 and 5500 trucks equipped with a 6.7L Cummins diesel engine. Doser control unit heater thaw time improvements have been developed, requiring selectively erasing and reprogramming the doser control unit (DCU) with new software.
Software improvements are available for the diesel exhaust fluid (DEF) on vehicles equipped with this engine. The new software contains the following improvements and addresses the following conditions:
Increase in DEF thaw time when ambient and DEF tank temperatures are below 7 degrees F.
P208D (DEF reductant pump control circuit high)
P202E (DEF reductant injector performance
Flash reprogram the DCU with the latest software. Note that the ECM/PCM must be at the latest software calibration before proceeding with this DCU update. Clear any DTCs that may have set due to reprogramming.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.