Rick's Free Auto Repair Advice

Posts Tagged: Exhaust Gas Recirculation

P0405 code for EGR — What it means and how to fix it

Learn what a P0405 code for EGR means and how to fix the problem A P0405 code is defined as Exhaust Gas Recirculation (EGR) A Circuit Low; meaning that EGR Valve Position Sensor is giving low voltage readings that are usually below the .5 – 1.0 voltage range. It’s a generic code that indicates that the engine control module (ECM) has detected that the exhaust gas recirculation (EGR) sensor has gone below the specified range. The EGR system is responsible for diverting a certain amount of exhaust gas to the … Read More

P0404 code for EGR — What it means and how to fix it

Learn what a P0404 code for EGR means and how to fix the problem A P0404 code is defined as Exhaust Gas Recirculation Circuit Range/Performance; meaning that the EGR valve is performing outside your vehicle’s parameters. More specifically, the P0404 code can 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 system … Read More

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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