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General Motors began using diesel exhaust fluid (DEF) in its Duramax diesel engines starting with the 2011 model year. This was part of the implementation of the EPA's stricter emissions standards, which aimed to reduce nitrogen oxide (NOx) emissions. The use of DEF helps improve the overall efficiency and environmental performance of the engine.

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1mo ago

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What model year engine did gm start using def in duramax?

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To reset the exhaust fluid system on a Duramax engine, you typically need to use a diagnostic tool or scan tool that can communicate with the vehicle's onboard computer. Connect the tool to the OBD-II port, navigate to the appropriate menu for exhaust fluid or DEF (diesel exhaust fluid) settings, and select the option to reset or clear the warning. Ensure that the DEF tank is filled to avoid future warnings. Always consult the vehicle's service manual for specific instructions related to your model year.


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