In modern diesel systems, the Diesel Exhaust Fluid (DEF) circuit has become critical—not optional—to meet emissions standards and avoid costly engine derates or fault codes. For REV Group vehicles running the Cummins ISL engine, the REV Group Cummins ISL DEF Head Unit (OEM 719006, Tamerx part 5410-11-FA01-5) serves as a vital conduit for accurate dosing, sensing, and regulation of DEF within the exhaust aftertreatment system. A failing or worn head unit can disrupt readings, trigger warnings, or even push your engine into limp mode.
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Regulates DEF dosing into the exhaust stream based on sensor feedback
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Monitors fluid level, temperature, and urea concentration to feed the engine control module valid data
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Precisely engineered to OEM 719006 specifications, ensuring plug-and-play compatibility
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Prevents SCR system errors, warning lights, or engine derates caused by mis-measurements
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Built to resist vibration, corrosion, and thermal stress encountered in daily operation
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Designed for quick replacement to reduce downtime and restore emissions compliance
Don’t risk leaving your emissions system to chance. Installing the OEM 719006 REV Group Cummins ISL DEF Head Unit helps maintain accurate dosing, prevents errors, and gives you confidence that your vehicle stays emissions-ready. For drivers and fleet managers relying on REV Group trucks, this component is one of your best safeguards against unwelcome maintenance surprises.