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Cummins · Fuel System
5578983
In stock · ships from Knoxville
The 5578983 is a DEF (Diesel Exhaust Fluid) dosing injector pump that precisely injects DEF into the exhaust stream of a diesel engine's Selective Catalytic Reduction (SCR) system.
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Verified fitment for 3 applications
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All confirmed applications for this part number.
Peterbilt
Other applications
Peterbilt
Other applications
Primarily intended for Cummins ISB and QSB engines meeting EPA21 emissions standards, commonly found in medium-duty trucks and buses. Also sold as a Genuine Paccar part for Peterbilt applications using the same Cummins engine platform. Verified to fit model years 2014-2022 by multiple retailers.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 13 of 13.
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It plays a key role in reducing NOx emissions. Over time, the injector can clog, crystallize DEF, or fail electrically, triggering fault codes, poor emissions performance, or engine derates. Replacing a malfunctioning unit with a genuine Cummins doser restores proper aftertreatment operation and helps avoid costly SCR and NOx sensor damage.
Part Number: 5578983
DEF DOSER
Vendor: MHC Kenworth
Dealer: KP Services Crossville
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