Service Solution for False DEF Fault Codes on chassis with Cummins engines

Bulletin number

SS1034491

Component

Engine and engine cooling

Summary

Service Solution for False DEF Fault Codes on chassis with Cummins engines. Symptoms are various active and inactive fault codes for DEF Quality or DEF level. The issue could be caused by the coolant hoses swapped at the bulkhead fittings, thru the frame rail causing the coolant flow inside the header assembly to be reversed.

Owners of these vehicles have filed 2 complaints in the engine category.