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Gm trouble codes explained

Engine light on.code p4009 shows up.No power going to vent solenoid.Where does the power come from that controls this circuit.(ignition)

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Posted on Jan 02, 2017

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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

  • 1986 Answers

SOURCE: check engine code "P0446 Evap Control System Vent Control Circ"

Unfortunately, this code has nothing to do with the gas cap....
A code P0446 could mean one or more of the following has happened:

  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Here are some things you could try to fix it:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

Posted on Nov 17, 2009

  • 389 Answers

SOURCE: engine light on, troublecode p0480, fan 1 control

I am not up on those trouble lights but I have been told that if you remove the negative battery cable termanal and turn on your headlights after the cable is removed and let it sit for 1/2 an hour that it will re-set the computer back to default settings. The lights are turned on to drain any reserve power that is stored. It can't hurt to try it and see what happens. I hope this helps, The Raz

Posted on Apr 16, 2010

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SOURCE: I have 2006 GMC Sierra SLE 4WD 5.3 liter and my

There is a solenoid that open and closes with 12 volts, usually located close to the fuel filler tube area. This open to allow you to fill your tank, then closes after some inputs for the computer are satisfied, and then a pressure sensor verifies the system is working. First, make sure the cgas cap is tight, and if the light doesn't go away in a couple days of normal driving, get the solenoid checked.

Posted on Jun 23, 2010

  • 17970 Answers

SOURCE: code po449 States "Evaporative emission control

Check engine P codes. GM uses an EVAP solenoid that is located under most vehicles near the gas tank and connects to the charcoal filter can. Codes can be set and will drive you crazy trying to figure out if you have a bad gas cap, broke lines---this is where they try to get you to do a smoke test, or you just think the vehicle is no good.

Relax, it is usually an easy fix and one GM has known about for years but continues to make easy money off people who cannot do basic maintenance. Now one code that comes up is usually P0449, along with maybe a warning to check the gas cap to see if it is on tight. Chevrolet will gladly read this code out for you for around $98.00 and then fix it for another around $100.00 which includes the EVAP part which if you buy at their parts dept. will cost you $32.00 and my dealership parts man told me they sell one a day! It is easy money for them and obviously a defective part they keep using for the last 10 or 15 years but hey, its money in their pocket. Here is how to fix it with ONE single common screwdriver!

Get under the vehicle after putting on the parking brake and if you a little hefty, then removing the spare tire on the some vehicles will give you lots more room. The EVAP solenoid is easy to spot near the gas tank and it has one electric connector which disconnects by releasing the plastic clip and pulling the connector out. It also has ONE air line connected which goes to the charcoal cannister which also can be removed with the one screwdriver. The whole EVAP solenoid and air can can be removed with the screwdriver which makes it easier to unpolug the electric and air line. Get a replacement from the dealer as they certainly are familar with this part as they sell LOTS of them. Then just go under and plug the new one in and the problem is solved. Now if you do not have a tool to reset the codes, try the local parts places as most of them will do a reset for you. If you do not have someone to do it, it can be done simply be removing the RED, positive lead off the battery and wait a minute and then plug it back in. The codes are reset but of course now you have to reset the radio and clock stuff.

Hope helps (remember to rate this answer).

Posted on Nov 15, 2010

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Check engine light on, the code is P0449 on a 2009 chevy treverse need a wiring diagram How to fix it

Hello there

Lots of people seem to get this code.

Electrical diagram is included in the Haynes Manual (which EVERYBODY should have for their car !!) Available here.
This says the vent valve/solenoid in the evaporative emission control system.

Something similar here which will be of use to you.
Vent Solenoid problem ...changed seems to have cured it.

Sep 21, 2014 | 2009 Chevrolet Traverse

1 Answer

Whate code is p0498

which engine?,. we can not guess that. ever
ill answer for 3.6L engine.
Trouble Code: p0498
Evaporative Emission System Vent Valve Control Circuit Low
Number of Trips to Set Code: 2
Trouble Code Conditions:
EVAP canister vent solenoid valve control circuit is shorted to ground circuit.
Possible Causes:
  • EVAP canister vent solenoid valve and/or its circuit
  • ECM
that is what the FSM page shows. for DTCs
then shows what tests to do.
all that is in the FSM.
read it , do it or get it fixed by those that can.
here is a $4 day pass.

first check the fuses.
then do the tests.

Apr 11, 2014 | 2008 Suzuki XL7

1 Answer

Code p0449

This code is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model. The Powertrain Control Module (PCM) / Engine Management Computer (EMC) / Engine Control Module (ECM) has detected a fault with the circuit that controls the vent for evaporative emission systems vapor. As fuel sits in the tank it lets out fuel vapor, while driving this vent opens and allows the vapors to be circulated into the engine intake manifold, a charcoal canister or into the atmosphere, depending on the vehicle. This vent valve is apart of the simple, yet complicated evaporative emissions system. Symptoms Symptoms of a P0449 DTC will include Malfunction Indicator Lamp (MIL) illumination, you will likely not notice any other symptoms. Causes Potential causes may include: Faulty vent valve Wire/circuit issue PCM/EMC/ECM fault Possible Solutions Some steps to take to diagnose and repair this trouble code include the following: Check your fuses, there may be a fuse that powers the vent solenoid. Check for a rubbed-through or chafed wiring harness. Check both wires to see if they are shorted to each other, to ground or power. Visually inspect the vent valve for cracks or damage. Trace the wires to and from the PCM/EMC/ECM and check for continuity continuity using a digital volt ohm meter (DVOM). If you have access to an advanced level scan tool, actuate the valve while reading power and ground at the connector or by simply using a bulb wired to both terminals, it will light up if power and ground are OK. Using a DVOM, check the resistance of the vent, in most cases the resistance reading should be low, refer to the manufacturer's specification or compare it to a new one. Too high or low a value indicates a faulty coil inside the valve, thusly meaning replacement is necessary. This code seems to be prevalent on Dodge, Chrsyler, and Jeep products. In those cases the vent valve was bad. With GM products (specifically pickups), GM has released a new updated valve assembly. Finally, remove the valve, you may be able to access the pintle inside and it simply could just be sticking from fuel residue. Clean it and retest.

Read more at:

Oct 06, 2013 | 2010 Chevrolet Camaro

1 Answer

What is the solution to fixing trouble code P0449 in a 2002 Ponitac Grand AM?

Code 449 is for a problem with the vent valve solenoid for the EVAP system. The computer uses the EVAP system to vent the gas tank to the vapor canister when the engine is running.
The valve would need to be tested and may need to be replaced. As far as I know, GM will not pay once the car is past the 7 yr 70,000 mile warranty.

May 03, 2013 | 2002 Pontiac Grand Am

1 Answer

Engine code 499

I am Assuming that it is a "P" Code so the code is actually P0449.

P0449 is evaporative emission control system - vent valve / solenoid circuit

The vent solenoid might be bad. You need to see If you are getting power to it. The computer provides a ground for the solenoid. You can test it by applying a power and a ground to the solenoid to see if it operates and open's and Close's. ( I am taking into V6 engine ).

Follow the 2 diagrams :-

Apr 05, 2013 | 2008 Chevrolet Equinox

2 Answers

I have 2006 GMC Sierra SLE 4WD 5.3 liter and my engine light comes on giving me the code PO449 Evaporative Emission Control System Vent Valve/ Solenoid Circuit Malfuction. What could cause this code to...

There is a solenoid that open and closes with 12 volts, usually located close to the fuel filler tube area. This open to allow you to fill your tank, then closes after some inputs for the computer are satisfied, and then a pressure sensor verifies the system is working. First, make sure the cgas cap is tight, and if the light doesn't go away in a couple days of normal driving, get the solenoid checked.

Jun 23, 2010 | 2006 GMC Sierra 1500 2WD

1 Answer

Trouble code po449 2006 chevy avalanche


Aug 19, 2009 | 2003 Chevrolet Silverado 1500

2 Answers

Engine trouble code 0499 2004 dodge dakota manual 5 speed 4.7 4x4

P0499 Evaporative Emission System Vent Valve Control Circuit High, REPLACE THE SOLENOID.

Jun 24, 2009 | 2004 Dodge Dakota

2 Answers

I have a 2004 Avalanche, 49K mileage, code PO446, charcoal in line, recomended replace fuel/evap canister, vent valve & purge valve, blow out lines. Does this sound right? Can this be done at home?

That is an EVAP code. its a vent control code. you can manually test it by powering it up if you know where its at. i cant remember exaclty where its at off the top of my head but its only 2 wires. using a volt meter you want to make sure power is getting to it, but you cannot activate it without dealer scan tool.hmmm if you can figure out which is ground and power when you give it 12 volts it should click. meaning your vent solenoid works and you have wiring problems or its leaking.

EVAP problems are hard to finde with out scanners. you can change the vent solenoid and hope it fixes it. but a code points you to the direction of a problem. hopefull its not wiring problems. in the northern states with snow. ice can pull out wires and also get clogged in the vent solenoid and lock it up. its either wiring or bad or a leaking solenoid. check condition of wires. if they look good try a vent soleniod.

if that doesnt fix it after a engine light reset and 2 weeks or so. then goto dealer. you need to reset it after repair. light will not go off on its own.GOOD LUCK

ASE certified.
plz rate

Apr 29, 2009 | 2002 Chevrolet Avalanche

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