Question about 2001 Buick Century

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"Service engine soon" light is on

We have replaced EGR valve and the light will go out for a little while and then it will glitch and come back on. We think it may be one of the 5 wires leading to it but don't know which one. Help!

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  • Coleen Bush Nov 29, 2008

    We have not actually tried this yet because our friend, who is a mechanic, is out of town. However this is something he had not thought of and is going to try. I will let you know if this is not the solution and see if you have any other ideas.

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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.

Posted on Nov 27, 2008

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Are you sure you have EGR flow?? Hold the EGR valve open the engine should run poorly, if not you have no flow.

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P0406 - Exhaust Gas Recirculation Sensor A Circuit High

Early Models : The EGR valve control the amount of exhaust gas routed to the intake manifold. Vacuum is applied to the EGR valve in response to the throttle opening. The vacuum control the movement of the taper valve connected to the vacuum diaphragm in the EGR valve.

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Late Models : The EGR volume control valve uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECM. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECM does not issue the pulse signal. A certain voltage signal is issued so that the valve remains at that particular opening.

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Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation

Possible causes
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
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Possible solution
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- Replaced EGR volume control valve
When is the code detected?
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You should be fine. Usually what happens is when such a part causes the light to go on, the light will continue to come on again a few time after replacement of the part.

Simply disconnect the battery and let it sit for about 1minute (oat least 30 sec). Then reconnect the battery.

Drive the vehicle and if the light still comes one, take it to an auto parts dealer that can do a diagnostics test and ask them to clear the codes.

Even after this the light may come on - drive for about a week more and if it still stays on, then have the test done again and replace any other part that any codes may present faulty.

Otherwise, sometimes it itakes the computer and engine to adjust to the new part and get an accurate (consistant) reading until the light will stay off.

A lot of the time a light will come on if the O2 sensor(s) are bad. This isnt' a huge issue right aways, will slightly affect feul mileage and the amount of exhaust return into the engine for being reburned. Replace these if necessar (and if affordable).

Please let me know if you need any further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

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If the replaced the erg valve and the light came back on, you still have a problem, probably different then what they fixed.

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