P0400 Code - Exhaust Gas Recirculation Flow Malfunction

What Does P0400 Mean?

P0400 is an OBD-II generic code that the engine control module (ECM) detected the engine exhaust gas recirculation (EGR) valve is not flowing recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold.

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What are the common causes of P0400 ?

The most common causes of this code are clogged EGR passages and clogged DPFE sensor passages. You may also suspect a faulty EGR sensor, MAP sensor, faulty EGR valve, faulty EGR control solenoid, a broken vacuum line, or faulty electrical wiring (or connectors) as possible causes.



How do you troubleshoot P0400 ?

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

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• exhaust gas recirculation flow insufficient detected