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P0401 Acura

P0401 Acura - Exhaust Gas Recirculation Insufficient Flow

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P0401 Acura Comments |  Add Comment
Possible causes
- 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
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Tech notes
EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages.

P0401, 1999 Acura TL Honda V6





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When is the code detected?
Low EGR flow control is detected
Possible symptoms
- 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.

ACURA Technical Service Bulletins for P0401 code
1999 ACURA TL Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
2000 ACURA TL Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
2001 ACURA TL Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
1997 ACURA CL Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
1998 ACURA CL Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
1999 ACURA CL Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
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