- Exhaust Gas Recirculation Valve harness is open or shorted - Exhaust Gas Recirculation Valve circuit poor electrical connection - Faulty Exhaust Gas Recirculation Valve - Exhaust Gas Recirculation Valve clogged - Exhaust gas leaks
- Engine Light ON (or Service Engine Soon Warning Light) - Possible engine hesitation
P0401 Acura Description
The exhaust gas recirculation (EGR) system reduces oxides of nitrogen (NOx). NOx is generated by high combustion temperatures.
The EGR system lowers peak combustion temperature by recirculating inactive exhaust gas into the air/fuel mixture, thus reducing NOx emissions.
The EGR valve position sensor is built into the EGR valve and detects the amount of valve lift. The command value for the target valve lift is previously stored in the powertrain control module (PCM) so that exhaust gas recirculation can be optimized according to driving conditions.
Comparing this command value with the EGR valve position sensor output signal value, the PCM controls the EGR valve to make the amount of actual valve lift equal to the command value.
If the EGR valve position sensor output signal value differs greatly from the command value in the PCM memory for a set period of time, the EGR valve or the EGR valve position sensor is considered faulty and a DTC is stored.
Need more help?
Do you need more help with the P0401 Acura code? ask a question to our users or search the top hand picked automotive forums for more information
Need parts to fix this code? Search hundreds of stores at the same time and compare prices
Help us improve Engine-Codes.com. Leave a comment below or tell us if the information above help you fix the code. What are symptoms is your vehicle for the P0401 Acura code?
Have you replaced any parts? Any information is appreciated. Thanks