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Egr system fault exhaust gas recirulation. The ecm has detected too little flow on the egr system

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5 Suggested Answers

SOURCE: check engine lite,

took it to a shop

Posted on Jan 10, 2009

  • 414 Answers

SOURCE: my 2000 rodeo check engine is on so i hade it

Check the vacuum lines going to egr. An intake cleaning may also help.

Posted on Jun 26, 2009

  • 202 Answers

SOURCE: P0401 Exhaust Gas Recirculation Flow Insufficient

check the metal line that comes off the exhaust and make sure it isnt plugged with carbon. also remove the egr and check the port and see it's clogged as well

Posted on Nov 17, 2009

  • 22 Answers

SOURCE: emission test gives a p0401 code : exhaust gas

yes it is something to do with the egr
it could be the egr, dpfe, vacuum leak or wiring
best bet is to bring it to the dealer to have it properly diagnosed
so your not changing unnecessary parts

Posted on Jan 31, 2010

  • 1374 Answers

SOURCE: PO401 EGR , the ECM has detected too little flow

The EGR valve is towards the firewall and looks like a flying saucer with either a vacuum hose or electrical connectors attached to it.EGR stands for exhaust gas regulator. So this item has to be connected to your exhaust manifold. During engine operations in order to cool off combustion temperatures this valve opens and permits exhaust gases into combustion chamber.
Your code is saying that its passage way is clogged ,the valve is either stuck closed ,the vacuum or electrical system that control it are defective. I recommend you get the repair manual for this vehicle there are several types of EGR valves and the testing procedure are different for each one. If your good with a voltmeter than getting the manual for this vehicle is gonna save you a fortune.
The easiest thing to do when you locate the valve is to remove it, use gun out and spray the passage way it sits on . Then clean the valve itself. If it has a vacuum port hook it up to a vacuum pump and see if it holds vacuum ( about 3-5 hg's) and its pintel moves. if it does than valve is ok. Then replace gasket and install valve. If valve has electrical connectors then clean passage and valve replace gasket and install valve.Your gonna have to go to Autozone again to have them erase code before you know for sure you repaired the item. Good luck

Posted on May 19, 2010

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when you have done everything make sure that you use a scan tool to reset the ECM
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- EGR Temperature Sensor circuit poor electrical connection
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I had an OBD II 401 code and fixed it by cleaning out the EGR vacuum line in the intake manifold. I removed teh EGR Valve and the set screw below it. i used a rifle cleaning brush and one length of the rod. Then I replaced teh set screw. I started teh engind and let the vacuum **** some carb cleaner through the front port hole. when it was sucking good I replaced teh EGR valve and reset the codes. That fixed it.8_26_2012_9_39_13_pm.jpg

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