P0401 HONDA - Exhaust Gas Recirculation Insufficient Flow
- 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
The problem is also common on most 1998-2001 Honda Accord. The factory released a bulletin with instruction on how to clean the intake system.
P0401, 1999 Acura TL Honda V6
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When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0401 HONDA Description
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.
P0401 HONDA Information for specific Honda models
P0401 1999 HONDA ACCORD
P0401 2000 HONDA ACCORD
P0401 2001 HONDA ACCORD
P0401 1996 HONDA CIVIC
P0401 1997 HONDA CIVIC
P0401 1998 HONDA CIVIC
P0401 1999 HONDA CIVIC
P0401 2000 HONDA CIVIC
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