This dosing module is a key component of the Selective Catalytic Reduction (SCR) system, responsible for precisely injecting Diesel Exhaust Fluid (DEF) into the exhaust stream to reduce emissions. It is built to Volvo and Mack's exacting standards, ensuring accurate and reliable DEF delivery, unlike a malfunctioning module that may under or over-dose. Operators may observe increased exhaust emissions, engine derating, or illuminated SCR warning lights on the dashboard if this module fails.
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Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The initial symptom of a failing dosing module is often the illumination of the SCR system warning light on the dashboard. If ignored, the system may begin to under-dose or over-dose DEF, leading to increased exhaust emissions and potential engine derating. Continued operation with a faulty dosing module can result in non-compliance with emissions regulations and may lead to the engine being unable to restart after a shutdown.
Ensure the DEF lines and electrical connectors are clean and properly seated to prevent leaks or electrical faults. Do not attempt to clean the DEF injector nozzle with any foreign objects.
Inspect the DEF tank level and quality, as well as the SCR catalyst, for any issues when replacing the dosing module.