Question about 1999 Pontiac Sunfire

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1999 pontiac sunfire code p0440

Engine light comes on code p0440

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  • Anonymous Mar 17, 2009

    It isnt my gas cap and I replaced a censor that regulates the pressure in your gas tank b/c they told me that was the problem and the light is back on again

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  • Pontiac Master
  • 61,118 Answers

P0440 - Evaporative Emission (EVAP) System, this code is most often caused by leaving the gas cap loose, or off.

Posted on Sep 21, 2008

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My 99 pontiac sunfire check engine light came on as I give it gas its really bogging stalling ?


You need to check engine codes to determine which circuit is giving you the problem. Have a visual inspection under the hood to make sure no hoses etc are disconnected

May 18, 2015 | 1999 Pontiac Sunfire

1 Answer

I have a 2002 sunfire the check enigine light came on, I went and had the code reader read the problem and its coming back as P0440. I checked the Gas cap and it seems perfectly fine, I read that I sh


pressure test radiator by colour check system ,or check for petrol vapour in header tank or radiator, check oil in engine to see if it is contaminated with water oil ,could be leaking rocker cover gasket causeing plugs to missfire if gas, petrol smell from water its head gasket ,water in oil headgasket, oil in water headgaskget if any of these requires head skim and head pressure test by a engineer

Aug 16, 2012 | 2002 Pontiac Sunfire

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Solution for 1999 chevy cavalier code p0440


There has been a service bulletin isued for that code. I have run into this before, also the wires comming out of the connector. That would bethe first thing to check. Here is what the bulletin states. Emissions - SES Lamp ON/DTC P0440 (EVAP) SetNotesFile In Section: 06 - Engine/Propulsion SystemBulletin No.: 02-06-04-044Date: August, 2002TECHNICALSubject: Service Engine Soon (SES) Light Illuminated, DTC P0440 Set (Replace Fuel Tank Evaporative Emissions Control System (EVAP) Vent Solenoid Harness) Models: 2000-2002 Chevrolet Cavalier2000-2002 Pontiac Sunfire ConditionSome customers may comment that the SES light is/was illuminated.A technician may find DTC P0440 is stored in the PCM.CauseThe EVAP solenoid harness may be misrouted around the rear antilock brake (ABS) wire harness causing a chaff/damage to the EVAP vent solenoid harness, setting DTC P0440.CorrectionFollow the service procedure below to diagnose and correct this condition.1. Install a Tech 2 scan tool and select the appropriate vehicle. Verify that a DTC P0440 is stored in the PCM. 2. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID # XXXXX).

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Locate and inspect the EVAP vent solenoid harness (3) routing. The harness may be routed below the ABS wiring harness (4) at the right rear corner of the fuel tank, causing stress on the EVAP solenoid harness (3).



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4.Disconnect the EVAP vent solenoid harness (3) from the EVAP vent solenoid (2) and connector C313 (1). Discard the EVAP vent solenoid harness (3).


5.Connect the new EVAP vent solenoid harness (3), P/N 22687059, to the EVAP vent solenoid (2), route the harness above the rear ABS harness (4) and connect the EVAP vent solenoid harness (3) to connector C313 (1).


6.Lower the vehicle.


7.Clear the DTC's with the Tech 2 scan tool.



If all of the wires are good you will want to check for any leaks in the evap system.



Hope helps.

Apr 09, 2012 | 1999 Chevrolet Cavalier

1 Answer

Code P0440 on 2001 Sunfire


I would say start by replacing the gas cap with a genuine GM product. If that doesn't fix it there are a few more suggestions here --> P0440 @ OBD-Codes.com

Mar 04, 2010 | 2001 Pontiac Sunfire

1 Answer

I have a 1999 Pontiac Sunfire and I had a cjeck engine light come on. I diagnosed it with my OBD 11 and it came up with a 440 code. The gas cap is on tight, where do I go from here Thanks Keith


Take the gas cap off and put it back on then clear the code. This happens some times when the gas cap is put on wrong or not put on at all.

Mar 03, 2010 | 2002 Pontiac Sunfire

2 Answers

Engine light codes p0440,p0442-found a fuel leak on left top side of engine,has a vacuum hose hooked to it is this the fuel pressure regualator?


P0442 Evaporative Emission Control System Leak Detected (small leak)
P0440 Evaporative Emission Control System Malfunction

Jan 30, 2010 | 2000 Pontiac Grand Am GT

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1999 sunfire engine light comes and goes error code 442 is this the evap valve and if so is it a big job


its a small evap leak, could be gas cap, or filler neck, or ring at top of fuel tank to secure the pump. if you are in a rusty area, the necks are bad about a hole rusting in them.

Oct 13, 2009 | 1999 Pontiac Sunfire

2 Answers

Timing chain jumped


if it is a zero tolerance engine there is the possibilty valve damage has occured, depends if you were driving the car and at what speed it happened

Nov 19, 2008 | 1999 Pontiac Sunfire

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