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Posts Tagged: P0400

P0400 code — What it means and how to fix it

Learn what a P0400 code means and how to fix it A P0400 code is defined as Exhaust Gas Recirculation Flow Malfunction; meaning that the EGR valve isn’t responding properly to the EGR flow command issued by the ECM. More specifically, it could mean the valve is closed when it should be open or vice-versa or that the EGR passage is restricted. It’s a generic code that indicates that the engine control module (ECM) has detected that the exhaust gas recirculation isn’t what the ECM expected to see. The EGR … Read More


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