When your vehicle is built on a CMI frame powered by the Cummins ISB 6.7L engine, each component in the emissions system must work flawlessly—especially the DEF head unit. The CMI Cummins ISB 6.7L DEF Head Unit (OEM CM205532) is not just another sensor module—it’s essential for proper monitoring, fluid dosing, and diagnostics. A failure in this unit can trigger costly fault codes, degrade performance, or even force unwanted engine derates.
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Monitors key parameters of your DEF system: fluid level, temperature, and urea concentration
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Regulates accurate dosing of DEF into the exhaust stream to support the SCR (Selective Catalytic Reduction) system
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Built to OEM spec (CM205532) to ensure seamless integration with CMI / Cummins ISB 6.7L applications
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Helps prevent the dreaded engine derate or warning lamps that stem from faulty readings
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Designed to endure vibration, thermal cycling, and exposure to DEF fluid chemistry
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Easy to replace in the field—cutting down on downtime and service costs
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Backed by a 1,000,000-mile or 1-year warranty when installed by professionals
If your emissions system is acting up—fault codes, reduced power, or unexpected warnings—the DEF head is often the first suspect. Installing the OEM CM205532 unit restores your system’s accuracy, prevents unwelcome surprises, and keeps your CMI Cummins ISB 6.7L platform emissions-compliant and reliable.