I have a 2001 bonneville that has 144,000 miles. Two weeks ago my car start sputtering and the check engine light was flashing. So 1 code I keep seeing is 0440. I have turned up the car. New plugs

Lana Watson

Asked by Mar 25, 2015 at 11:04 PM about the 2001 Pontiac Bonneville SE

Question type: Maintenance & Repair

New plugs and wires. Air filter,  new egr
valve, fuel filter and where the spark plugs
go guess the module brand new replaced.  
The sputtering stop but the check engine
light won't go away. What else can I do to
fix this issue? I need to pass emissions by
end of this month.

2 Answers


That is an evap code. Could be bad /loose gas cap, bad purge solenoid or canister, or a leak somewhere in the evap system. Topping off the gas tank can cause this, gas gets into the vent of the evap system. The most common problem is a gas cap though.

1 out of 1 people think this is helpful.

Trouble code P0440 is for the EVAP system. The EVAP system routes gasoline fumes back to the engine to be burned instead of releasing them into the air. The computer has detected a leak in the system. That's why the check engine light is on and the trouble code is in the computer. The very first thing to do is check or replace the gas cap. Make sure it's on securely. If it's not, you'll have this problem. If the gas cap is ok you'll need to have a smoke test done at a service facility. Because your car is a post-1999 model the leak may be too small to be seen with the naked eye. The shop will force a harmless smoke in the gas tank and carefully inspect the EVAP system hoses to see where the smoke is coming out. Where they see smoke is where the system is leaking. Once the leak is fixed be sure they clear the computer. Then drive normally for about 1 week to set the readiness monitors for your emissions test. During this time keep your gas tank between 1/4 and 3/4 full. No more and no less. This way all the tests will run, all the readiness monitors will set, and you'll be good to go to inspection. HTH. -Jim

Your Answer

Add photo

Related Questions

  • I am the original owner of a 2001 Pontiac Bonneville. 10 answers

    The check engine light is on. The code P1404 was read by a shop and by me using my scan tool. Two new EGR valves were put on and the code cleared after each installation However, the light came back ...

    2001 Pontiac Bonneville SLE


    Maintenance & Repair

  • How long does it take for the evap and condenser codes to stop flashing after they have been reset 15 answers

    I recently had some work done and all the codes cleared and those 2 are still flashing

    2001 Pontiac Bonneville SE


    Maintenance & Repair

  • 2000 Bonneville SE won't start/crank after white smoke loud noise 3 answers

    2000 BONNEVILLE SE, 3.8 ltr, 6 cyl SERIES ii ENGINE CAR WON’T START / CRANK - WHITE ENGINE SMOKE / LOUD NOISE SYMPTOMS: extensive white smoke coming from radiator area from under hood, with a smell ...

    2000 Pontiac Bonneville SE


    Maintenance & Repair

  • 95 Bonneville Cranking No Start 19 answers

    My 95 Bonneville Cranks but won't run. Out of nowhere the car died on while driving. Thought it was the fuel pump at first but I changed that out only to find that the old one was still some good....

    1995 Pontiac Bonneville 4 Dr SE Sedan


    Maintenance & Repair

  • did they kill my car? 17 answers

    help! last week i took my year old 2014 prius 2 in for scheduled maintenance- which included oil change. on my way home, i noticed i was "smoking". i pulled over to be sure i wasn't on fire & discov...

    2014 Toyota Prius Two


    Maintenance & Repair

Search Pontiac Bonneville Questions

Pontiac Bonneville Experts

#1 ticklemedaly
Reputation 350
#2 dandyoun
Reputation 290
#3 John Saffrahn
John Saffrahn
Reputation 280
View All

Related Models For Sale

Used Pontiac Grand Prix"
28 Great Deals out of 4,398 listings starting at $1,972
Used Chevrolet Impala"
948 Great Deals out of 35,753 listings starting at $700
Used Buick Regal"
189 Great Deals out of 10,602 listings starting at $1,995
Used Chevrolet Monte Carlo"
16 Great Deals out of 2,070 listings starting at $2,000
Used Chevrolet Camaro"
812 Great Deals out of 38,796 listings starting at $2,650
Used Pontiac Grand Am"
2,000 listings starting at $1,995
Used Buick LeSabre"
15 Great Deals out of 2,572 listings starting at $1,950
Used Pontiac Firebird"
11 Great Deals out of 895 listings starting at $2,900
Used Chevrolet Malibu"
1,147 Great Deals out of 72,633 listings starting at $695
Used Chevrolet Tahoe"
1,056 Great Deals out of 36,219 listings starting at $1,700