Owning or operating a vehicle with a Lodal body and a Cummins ISB 6.7L engine means your emissions aftertreatment system must be precise at every point. The DEF (Diesel Exhaust Fluid) head unit is one of those underappreciated components that quietly governs whether your SCR (Selective Catalytic Reduction) system behaves—or throws errors. The Lodal Cummins ISB 6.7L DEF Head Unit, OEM 3600821, is designed to keep your emission feedback, dosing, and diagnostics in check.
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Measures DEF fluid level, temperature, and urea concentration, relaying precise data to your engine control module
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Regulates accurate dosing of DEF into the exhaust stream, ensuring your SCR system can convert NOx efficiently
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Constructed to OEM 3600821 tolerances for plug-and-play compatibility with Lodal / ISB 6.7L setups
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Helps prevent fault codes, emission warnings, and engine derates triggered by sensor drift or inaccurate signals
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Designed to endure vibration, thermal cycling, and exposure to DEF fluid chemistry
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Includes internal filtering (around 40 microns) to help guard against contamination
A failing or miscalibrated DEF head often doesn’t announce itself until your vehicle shows a warning or loses power. But by then, your emissions system may already be compromised. Installing a proper OEM 3600821 Lodal Cummins ISB 6.7L DEF Head Unit restores feedback integrity, helps your SCR work correctly under all conditions, and reduces the risk of surprise breakdowns. In emissions control systems, every link matters—and this one is no exception.




















































































































































































































































































