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Transmission won’t shift at all (manual or automated) The air module may be stuck closed or not receiving proper signal/pressure
Brake components (in systems that integrate brake control)
the actuator motor fails
It prevents:
Fault codes (like P0600
4378049NX | Genuine Cummins® Diesel Exhaust Fluid Header Roof Marker Transmission won’t shift at allDescription: A Diesel Exhaust Fluid (DEF) header 4378049NX is a key component in a diesel vehicles emissions control system, specifically within the Selective Catalytic Reduction (SCR) system. The DEF header (also called a DEF tank head or DEF sender assembly) is the unit mounted on or inside the DEF tank. It monitors and manages the Diesel Exhaust Fluid thats injected into the exhaust to reduce harmful nitrogen oxide (NOx) emissions. Part Number:
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