What is causing this Check engine light

5

Asked by Oct 10, 2016 at 05:11 PM about the 2006 Chevrolet Impala LT

Question type: Maintenance & Repair

My check engine light is on and solid on my 2006 impala LT 3.9L V6. the
message center is telling me to tighten my gas cap... ive replaced gas cap 4
times now and got the car scanned for codes...got a P0455 so i replaced my
purge valve solenoid which is located on the top of the engine with no success
anything else that would cause this issue?

2 Answers

30

You need to smoke test the evap system to determine where the leak could be. It's the only way to isolate the problem component without replacing all the components of the system. The top two hits on identifix are the purge valve, which you already did, and the gas cap, which you already did. It could be the fuel tank pressure sensor, but without a smoke machine its jut guess work.

1 out of 1 people think this is helpful.
65,055

The FIRST thing you need to do is clear the computer after the repair. The code and light will remain on until the computer runs the diagnostic test on the EVAP system and verifies that the problem is fixed. The computer will only run this diagnosis of the system if your gas tank is between 3/4 and 1/4 full. No more and no less can be in there. So, in this order, fill up the gas tank, clear the computer, run the tank down to below the 1/4 mark, scan the computer and check that the EVAP system readiness monitor has reset. If it has reset and the code/check engine light does not return you're all set. If the readiness monitor has not reset (the EVAP monitor is sometimes hard to set) repeat the above instructions. If you get the code/check engine light back while doing this you must have the EVAP system smoke tested. That's the only way to find a leak in the system! HTH. -Jim

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • How to reset check engine light on 2000 impala 2 answers

    I replaced the crankshaft pulley on my 2000 Impala. Now I need to reset the check engine light. How do I reset it?

    2000 Chevrolet Impala Base

    -

    Maintenance & Repair

  • check engine and fuel light on 2 answers

    I have plenty of fuel..n car keep idling low...n then cut off..had Auto zone read codes off computer P0401 Insufficient EGR flow detected.. What's wrong with my car??

    2004 Chevrolet Impala LS

    -

    Maintenance & Repair

  • Engine Light 3 answers

    I put a cold Air intake on my vehicle and now the engine light stays on. I disconnected the battery for a couple hours it went off for about five minutes and now it's back on have any ideas

    2007 Chevrolet Impala LS

    -

    Maintenance & Repair

  • oil light 3 answers

    i have a 85 impala and my oil light came on today. i checked the oil and i have enough what other reason would cause it to turn on

    1985 Chevrolet Impala

    -

    Maintenance & Repair

  • check engine light fails to come on 2 answers

    Check engine light fails to come on at all when starting the van, and will not pass smog without it. What are the possible causes?

    1999 Chevrolet Astro LT AWD Passenger Van Extended

    -

    Maintenance & Repair

Search Chevrolet Impala Questions

Chevrolet Impala Experts

#1 Js08016
Js08016
Reputation 1,750
#2 Danny Wang
Danny Wang
Reputation 1,640
#3 Tom Demyan
Tom Demyan
Reputation 1,540
View All

Related Models For Sale

Used Chevrolet Malibu
876 Great Deals out of 81,397 listings starting at $995
Used Dodge Charger
294 Great Deals out of 27,423 listings starting at $2,250
Used Honda Accord
790 Great Deals out of 88,192 listings starting at $1,150
Used Chrysler 300
346 Great Deals out of 20,500 listings starting at $1,000
Used Nissan Maxima
290 Great Deals out of 26,473 listings starting at $1,300
Used Nissan Altima
878 Great Deals out of 80,282 listings starting at $1,800
Used Buick LaCrosse
177 Great Deals out of 22,166 listings starting at $990
Used Ford Mustang
396 Great Deals out of 47,365 listings starting at $1,999
Used Ford Fusion
1,056 Great Deals out of 85,329 listings starting at $1,900
Used Chevrolet Tahoe
587 Great Deals out of 27,619 listings starting at $1,500
Used Chevrolet Silverado 1500
1,742 Great Deals out of 169,935 listings starting at $1,800
Used Toyota Camry
853 Great Deals out of 90,973 listings starting at $249
Used Ford Taurus
249 Great Deals out of 20,437 listings starting at $1,100

Used Cars For Sale

2017 Chevrolet Impala LT For Sale
29 Great Deals out of 4,001 listings starting at $17,599
2016 Chevrolet Impala LT For Sale
23 Great Deals out of 887 listings starting at $15,499
2015 Chevrolet Impala LT For Sale
4 Great Deals out of 412 listings starting at $13,995
2014 Chevrolet Impala LT For Sale
9 Great Deals out of 426 listings starting at $10,495
2013 Chevrolet Impala LT For Sale
120 listings starting at $7,190