Question about Cadillac Cars & Trucks
I have a 2002 cadillac seville, the SES light is on I checked the codes. I have one code It's P0401. I would like to know what it is and how can I fix It.
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Posted on Jan 02, 2017
The service engine soon light indicates you have a problem with the engine management system.The only way to get it to stay off is to lacate and repair whatever is not working correctly. Requires very specialized equipment. Take it to your mechanic.
Posted on Nov 28, 2008
First thing you have to do is list all the codes, because some some might be stored for a long time. Pushing the OFF and WARM buttons together and holding will ghive you all the stored codes. Then press OFF and HI together to clear all codes. Hold and wait for bars or 0's. Now start your car and let it get up to proper operating temps. Take car for aride that aincludes all phases of driving including highway speeds. Observe SERVICE ENGINE LIGHT for coming on . Assuming it does , repeat steps previously provided, read codes stored and repair accordingly. If need be contact me with new codes and I will try to assist you.
Posted on Mar 16, 2009
P0401 = Exhaust Gas Recirculation, insufficient flow.
I would start with testing the EGR valve and checking the source line for a vacuum leak. EGR may need to be cleaned.
Posted on Jun 08, 2009
P0401: Isufficient Flow Detected in EGR system.
-clean the EGR port with the carburetor cleaner.
-clean the EGR passage inside the EGR valve with the caburetor cleaner.
Reset the light, if the light still coming back, then replace the EGR valve.
Posted on Apr 26, 2010
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