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2011 Dodge Ram 4500 6.7L with code P2BAC. What causes this code to come up?

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2011 Dodge Ram 4500 6.7L with code P2BAC. What causes this code to come up?

Vehicle: 2011 Dodge Ram 4500 6.7L

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P2BAC - NOx exceeded-Deactivation of EGR

This code appear as informative when a DTC (diagnaostic trouble code) is active, P2BAC will derate engine power until the DTC is inactive.
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P2BAC Dodge Code - NOx Exceedence - Deactivation of EGR
Read more: https://www.autocodes.com/p2bac_dodge.html

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