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Posts Tagged: P0400 Altima

P0400 Nissan Altima EGR Malfunction

Fix code P0400 Nissan Altima EGR Malfunction Nissan’s P0400 Nissan Altima EGR Malfunction is similar to other manufacturers. The PCM pulses a solenoid to regulate how much vacuum the EGR valve gets. That determines how far the valve opens. To determine if the valve is actually opening, the PCM looks to the EGR backpressure transducer and the EGR temperature sensor. If you get the P0400 Exhaust Gas Recirculation Flow Malfunction code, first check to make sure the hose to the bottom of the EGR valve is intact and not burned. … Read More


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