'99 Grand Am P1404 code/EGR valve

Asked by Apr 28, 2016 at 02:30 PM about the 1999 Pontiac Grand Am 2 Dr GT Coupe

Question type: Maintenance & Repair

Hello,

I have a 99 Grand Am with 3.4L v6. I am having
trouble with a P1404 (EGR closed performance)
code that keeps setting the check engine light. I
have replaced the valve 3 or 4 times over the past
few years in addition to rebuilding a few of them,
but the code keeps eventually coming back. It is
getting to the point where I suspect it might not
actually be the valve that is the problem. I checked
the electrical signals a year ago and everything
looked normal. I recently cleaned the mass air flow
sensor and throttle body, thinking that might be
throwing off the computer's readings. The engine
itself seems to be running fine at the moment
(though I have had some roughness at idle/low
throttle in the past), but the check engine light is
coming on just about every time I get off a
highway. Sometimes I also get an engine knock
sensor code in addition to the EGR. Does anyone
have any other ideas or  suggestions for what
might be causing this?

Thanks!
Scott

2 Answers

11,575

Yes, on this vehicle the EGR valve postion is a learned voltage in the PCM engine computer. Once again make sure its very clean... free of carbon in the valve, use magnification to inspect it and clean it again! now if you only do this the code will reappear-later.. even if you clear it with your code reader. The PCM must be disconnected from power supply / battery or it can't reset voltage correctly use your oscilloscope and you can confirm this CLSDV .076 is OK Regards

Thanks for the reply Auto_Centric - I tried what you suggested by disconnecting the battery for 30 minutes, but the same code came back as again today as soon as I got off the highway. Seems like it was too soon to throw the code (drove 30 miles at most) if the system was just reset unless it was some other problem? Any ideas? Thanks, Scott

Your Answer

Add photo

Related Questions

  • what does code p1404 mean that showed up on my car diagnostic check? 7 answers

    1999 Pontiac Grand Am 2 Dr SE Coupe

    -

    Maintenance & Repair

  • where is the brake pressure modulator valv located at on a 99 grand am 1 answer

    Hi I just got my car check out and was told that I need a new brake pressure modulator valve that mine is bad dose any one no where it is located at on a 99 grand am so I can replace it my self th...

    1999 Pontiac Grand Am 4 Dr SE Sedan

    -

    Maintenance & Repair

  • Help! 5 answers

    I purchased a used car recently and after about 2 weeks I've gotten the dreaded check engine light. I've taken it to Auto Zone and these are the codes it's indicating p1404, p0443, p0449 & p0141. A...

    2003 Pontiac Grand Am

    -

    Maintenance & Repair

  • 99 Grand Am SE 8 answers

    Help me! Every time i try to turn it on i have to try to crank it 3 or 4 times in order for it to start, has 180k miles, the Service Engine Soon light is on and so is Low Coolant. Also , sometimes ...

    1999 Pontiac Grand Am 4 Dr SE Sedan

    -

    Maintenance & Repair

  • Any suggestions for code P0420 & P1404 for a 3.8L? 2 answers

    Is an EGR Valve on a 3.8L difficult to clean or remove & replace? Most likely I will have to have a mechanic replace my Catalytic Converter. Is it best to purchase the Universal Catalytic Converter ...

    2002 Pontiac Grand Prix GT Coupe

    -

    Maintenance & Repair

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 1,299 nationwide Grand Am listings starting at $799.

ZIP:

Search Pontiac Grand Am Questions

Pontiac Grand Am Experts

#1 tenspeed
tenspeed
Reputation 7,490
#2 John Saffrahn
John Saffrahn
Reputation 1,580
#3 Tom Demyan
Tom Demyan
Reputation 1,390
View All

Related Models For Sale

Used Pontiac Grand Prix
23 Great Deals out of 2,855 listings starting at $879
Used Pontiac Firebird
8 Great Deals out of 796 listings starting at $1,800
Used Chevrolet Impala
588 Great Deals out of 29,008 listings starting at $1,300
Used Chevrolet Malibu
794 Great Deals out of 88,769 listings starting at $1,900
Used Honda Civic
508 Great Deals out of 81,680 listings starting at $558
Used Pontiac Bonneville
536 listings starting at $1,695
Used Honda Accord
717 Great Deals out of 83,067 listings starting at $500
Used Ford Mustang
327 Great Deals out of 45,932 listings starting at $2,000
Used Nissan Altima
843 Great Deals out of 78,324 listings starting at $470
Used Chevrolet Camaro
137 Great Deals out of 35,611 listings starting at $1,995
Used Toyota Camry
871 Great Deals out of 92,511 listings starting at $1,300

Used Cars For Sale

2004 Pontiac Grand Am For Sale
329 listings starting at $799