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On my 2007 GMC Envoy 5.3L, what does the code P1400 means?

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On my 2007 GMC Envoy 5.3L, what does the code P1400 means?

Vehicle: 2007 GMC Envoy 5.3L

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P1400 GMC - Cold Start Emission Reduction Control System

Read more: https://www.autocodes.com/p1400_gmc.html

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