Question about 2004 Chevrolet Venture Passanger

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2004 Chevy Venture. "Service engine soon" light on. Code PO401. I believe EGR passage in plugged. Will GM&#;s Top Engine Cleaner work?

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  • Contributor
  • 28 Answers

Diagnostic aids:
a vacuum restriction to the map sensor--a skewed map sensor reading can cause the PCM to read an incorrect MAP change during the EGR flow test
an engine that is running poorly due to mechanical condition such as worn piston rings, ect. can cause low engine vacuum thus EGR flow test will fail
excessif backpressure of the exhaust system can cause P0401
exhaust system leak can cause an insufficient amount of EGR flow
a restriction in the intake manifold such as carbon deposit and casting flash.

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

468 Chevelle
  • 81 Answers

SOURCE: Service engine code indicates EGR valve.

You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.

Posted on Mar 28, 2009

  • 1 Answer

SOURCE: 2004 pontiac grand am service engine soon light

I have the same car and if the gas cap is loos for any reason the service engine light will come on so check that. If it is it will turn off in a few days after you tighten it.

Posted on May 13, 2009

keithheavili
  • 410 Answers

SOURCE: 2003 Buick Regal Service Engine Soon light.

The error that I'm showing for error code P1133 is 
P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1(Rear Bank).  I would suggest having both of your Oxygen Sensors replaced if you haven't already had that done.  Hope this helps.  Thanks for an honest rating and for using FixYa.

Posted on May 19, 2009

  • 32 Answers

SOURCE: po452 trouble code changed sensor engine light

you might try unhooking the battiey for 20min both + and - posties cuz that will force the computor to have to resest only if you have addressied the fuel pressure problem which taht would most likly be your filter which isn't all that much

Posted on Sep 21, 2009

autotherapis
  • 501 Answers

SOURCE: Service engine soon light is flashing

When the light comes on without flashing, it just means an emissions problem, when it starts to flash it has become more serious. I suspect that there was an error putting the plugs and or wires. That computer can determine if there is a misfire and it will put out a P040X, code where X represents which cylinder is the problem. This will help you not have to take each one apart. If there are more than one, check each number.

Ex. P0401 means there is misfire on cylinder number 1

P0400 is a random misfire detected.

If you take it to an Advance or Autozone they will usually scan if for free.

By the way, if you used cheap plugs instead of platinum plugs that could do it too.

Hope this helps.

Posted on Nov 25, 2009

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1 Answer

Service engine soon light flashes only under accelation obd code po401 car shakes and stumbles and has limited power


EGR is stuck open, but a flashing engine light can be a misfire code also detecting a rich condition, right back to the egr.

Nov 09, 2011 | 1999 Mitsubishi Eclipse

1 Answer

Dtc po401. replaced egr, solenoid, & DPFE, check engine light still comes on. ANY ADVICE? Thanks


when you maunally open the egr valve does the engine run rough? it should. if it does not then you need to clean out the EGR passages. You have replaced a lot of parts that were good.

Sep 01, 2011 | 2002 Mercury Grand Marquis

5 Answers

ENGINE RUNS FINE. SERVICE LIGHT IS ON AND THE CODE NUMBER SHOWING IS PO401. WHAT IS THIS FOR SAYING?


  1. po401 refers to an insuffient flow of EGR gasses
  2. locate egr valve
  3. with engine running at idle
  4. on the underside of the valve you can access the diaphram.
  5. wearing glove if ness
  6. lift diaphram while idling
  7. does engine stall or run very rough?
  8. if not remove valve
  9. start engine
  10. you should hear a very large vaccum leak and exhaust noise
  11. if either are missing investigate cause
  12. if ok reassemble.
  13. locate DPFE sensor
  14. inspect sensor for damage
  15. inspect hose to sensor for damage
  16. replace sensor
  17. 9ecffd7.gif

Aug 10, 2010 | 1999 Ford Taurus

1 Answer

Engine light on code reads po401


I believe this code is insufficient EGR flow. On this engine, the passages to the EGR valve often become carboned up and cause this code. Remove the EGR valve and inspect the passages to see if they need to be cleaned.

Jun 14, 2010 | 2006 Ford Mustang

1 Answer

I recently change the egr valve on my car due to P0401


Could be clogged egr passages in the intake. Also could be just do to a reflash needed of the computer. GM has come up with new software for the computer to fix this problem.

May 19, 2010 | 2000 Chevrolet Monte Carlo

1 Answer

I have a ford explorer sport 2002 and my chek engine light came on it put out a code PO401 do you know what i need to buy


PO401 code means that:
The PCM has determined that there is insufficient flow in the exhaust gas recirculation system. Definition: EGR system fault (Exhaust Gas Recirculation) Probable Causes: a. Blocked passage on EGR system b. Failed EGR Valve c. EGR solenoid faulty d. Failed EGR pressure sensor where applicable e. Failed EGR position sensor where applicable

Mar 08, 2010 | 2002 Ford Explorer

2 Answers

The engine light is on with my 2001 ford explorer sport.


this code indicates that the exhaust gas recirculation valve (EGR for short) is not flowing enough gas, this can be caused by a defective valve or a plugged EGR gas passage, the plugged passage in the intake is the more common problem.

Apr 06, 2009 | Pontiac Bonneville Cars & Trucks

1 Answer

"Service engine soon" light is on


If you have the 3.1 engine, they are prone to having the egr passage clog up in the intake. There are 3 solenoids on the valve that open under differant load conditions. Sometimes during high egr flow demands the passageway is clogged enough for the computer to see not enough change in map or o2 sensor readings. Take off the valve, open up the throttle and see if there is carbon deposits caked up where the egr port is. If so get some GM top engine cleaner spray and a wire and clean the passage. This is a common problem.

Nov 27, 2008 | 2001 Buick Century

1 Answer

Code po401 chevy venture LS 1997


i would definitely clean out any residue i find in the exhaust passaged-cloggage can cause definite problems-clean all you find and go from there,if that doesnt work and code come back-replace the egr valve

Aug 12, 2008 | 1997 Chevrolet Venture

2 Answers

Ford explorer 2002 v-8 code po401 low flow on obd-2


Replacement engine put in with 51000 miles and now the engine light is on and the speedometer goes from 50 to 0 and then jerks

May 31, 2008 | 2002 Ford Explorer

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