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Chevrolet Spark lt , the malfunction indicator light is on since this morning . the light monitors the emission control system . how do I fix it . Thanks

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  • Tom Mooney May 21, 2011

    Please provide year, make, and model of your vehicle.



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Posted on Jan 02, 2017


SOURCE: po44o evap emission control--system malfunction....what

I heard that in most cases with the code PO44O it is just a "Loose" Gas Cap. You need to make sure the cap is turned until you hear several clicks. Then reset code and hopefully the light stays off.

Posted on Aug 06, 2008

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SOURCE: P0440 Evaporative Emission Control

You need a charcoal canister and vent control valve.

You also need the EGR solenoid valve (I think it the brown one).

Valve is located in the valley of the V, towards the transmission side of engine.

Do these 1st and reset light. You may have other issues but you have to start here.

Posted on Sep 16, 2008

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SOURCE: 2003 Mazda MPV trouble codes

check the pcv hose at the back of the intake manifold it often leaks and will cause several idle problems

Posted on Sep 29, 2008

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I will give you a little insight on what the P0440 fault is if you promise not to blame me if your taillight bulb burns out!!

A P0440 fault is general Evap system fault and could be as much as leaving your gas cap loose. ( but you probably wouldn't admit to it anyhow.)
Assuming that the gas cap is tight and not hanging off there are a couple of hoses that dry rot and could cause this fault to set, One is under the vehicle at the Canister and the other under the air cleaner. There is also a
switch called the NVLD (Natural Vapor Leak Detection) that is supposed to see a closed (sealed) input when the evaporative system is sealed and no leaks are present. If this switch goes bad it will also set this fault code.

A scan tool would be needed to see this input. With high mileage vehicle I would lean towards the hoses being cracked causing your problem. If you cant visual see any cracks in any hoses you may have to have a smoke test performed along with a scan tool connected to verify the fault and diagnose the problem.

I believe Auto Zone will scan your car for free but check the Gas Cap first or try replacing it. The gas cap is the cheapest to replace and most likely the problem.
Good luck and hope this helps. Oh and when you get the car scaned, they can clear your code. 
You can also try clearing the code by placing the ignition key to the run possition and removing the fuse to the ecm for 10 sec and placing it back in. 
Start the car and it may stall but let it, just start it up again and it should be fine. The computer is just re-learning the engine and you should have no code for now till it finds one.

Posted on May 02, 2009

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SOURCE: 2007 Chevrolet Uplander LT ABS and TC light on

We were having this problem...have your wheel bearing checked out. There was a sensor in the drivers side wheel bearing...once we replaced it (because it was going out) the ABS and Traction Control warning lights stopped coming on.

Posted on Jul 02, 2009

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A dash light came on that looks like an engine with a downward arrow going through it. When it came on the car would not go over 35-40 mph.

REDUCED ENGINE POWER: Refer to Engine Control Module Description for the 5.3L engine or Engine Control Module Description for the 6.0L engine
The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The engine control module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the ECM detects a malfunction, the ECM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM.
Your best bet is take it to a ASE certified repair shop or a Chevy dealer who has the tool to diagnose this problem before it strands you some where .

Dec 04, 2015 | 2006 Chevrolet TrailBlazer SS

1 Answer

Malfunction indicator light is on

The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone or Advanced auto parts in your area, they will read them for free. Once you have these code numbers, we can be a lot more specific about what your problem may be.

Aug 20, 2013 | Chevrolet Cars & Trucks

1 Answer

Malfunction Indicator light is on

could be many things, a MIL is turned on when your vehicle is not meeting the required emissions, take to a local garage to scan codes

Feb 06, 2013 | 2006 Chevrolet Malibu LT

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Check engine light code p1676 Chevy lumina Ltz

Trouble Code: P1676 (3.8L V6 VIN K Auto)
Evaporative Emission (EVAP) Purge Solenoid

Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
Conditions for Setting the DTC.
  • The ignition is on.
  • An improper voltage level has been detected on the output circuit which controls the EVAP purge solenoid.
  • The above conditions are present for at least 30 seconds.

Possible Causes:
  • Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
  • Damaged harness.
  • Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition on and observe a voltmeter connected between the EVAP purge solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the malfunction.

1998 Chevrolet Lumina - Powertrain - Engine Controls - 3.8L - DTC P1676 Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Aug 13, 2010 | 1998 Chevrolet Lumina

1 Answer

Malfunction indicator lamp in my toyota corolla is on how i fix?

The check engine light also called the malfunction indicator comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

May 27, 2010 | 2002 Toyota Camry

2 Answers


Hello. Your code indicates that your emission system is acting up. If you live in California, you might have a problem passing the next mandatory emmissions test. The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

The solenoids and system wiring are monitored for opens or shorts

Probable Causes
1- Purge or vent solenoids defective
2- Check connector and wiring
3- fuel, saturated vapor canister
4- Failed EVAP vent solenoid

Apr 08, 2010 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Malfunction Indicator Lamp Illuminates: Chev Aveo 2005

U can still drive the car, the light means that a malfuntion has occured in the engine/emission system electronic controls, have the system tested for the trouble code that was stored with the light.

Jun 18, 2009 | 2004 Chevrolet Aveo

3 Answers

2000 cavalier check engine light code po440

P0440 - Evaporative Emission (EVAP) System

evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.

The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.

Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking

Jun 06, 2009 | 2003 Chevrolet Cavalier

2 Answers

Codes 441, 446, 455 on a 2005 Camery

P0441 Evaporative Emission Control System Incorrect Purge Flow
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
P0455 Evaporative Emission Control System Leak Detected (Gross Leak)

Jun 04, 2009 | 2004 Lexus LS 430

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2002 Chevy Trailblazer w/101,000 mi has the P0440 OBD II Code. Just replaced the plugs with Iridiums @ 100K, all connections are good and gas cap is seated properly . . . help!!!

i have 2003 trailblazer ltz 153 000 mileage i have code po440 .i changed gas cap and turned off the chech engine light... i made 300 miles and it was good and today morning i drove a mile and light turned on ..... what do i have to fix ...thanks

Mar 22, 2009 | 2003 Chevrolet TrailBlazer

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