Check Engine Light - 2009 Silverado

Hoping for some help....

My Silverado(5.3L V8) has got about 103,000 miles on it. The check engine light came on about the time when it got to 20,000 engine hours.

Still runs great, but have no idea why the light is on. Already replaced gas cap but did not help.

I don't want to have to spend $150 just have someone look at it. Does anyone know how to get the fault code without having to plug it in to a computer?
Go to autozone or some place like that and have the code read and then post back what the code is. Somebody who knows about cars will chime in.

[This message has been edited by Sweet Kitten Feet (edited 7/26/2011 11:11a).]
10:1 it is an O2 sensor.
09 with over 100k miles? wow... maybe the check engine light is on because it sensed the wheels haven't stopped turning in 2 years.
^Yea...that's what happens when you have to commute from Katy to College Station every day.
Go to Autozone or Advance Auto Parts and have them pull the error code.

Is the check engine light solid or blinking?
My guess is the O2 sensor as well, but there's nothing wrong with the sensor your cat's are clogged and as a result you're getting a bad reading. I've seen it on mine and several friends Chevy's at that mileage.
If you are in Katy, go by Katy Exhaust Pros, Roger will pull the codes and give you a free estimate on fixing it.
Katy to College Station? That's more than 150 miles round trip. Good God, man, move closer or find another job (or school?).

Just dividing 100,000 by 730 days (2 years), that's 130 miles per day average! Or, a tank of gas every 2.25 days! I feel for your wallet. Unless you paid for you truck in cash, you're real upside down!
Sweet, I'm not the only one in this club on this board. My 2009 Silverado (purchased 12/26/08) has 104k.
Thanks ya'll. I got my exhaust done at Exhaust Pros so I think I will take it over there. Great bunch of guys over there. I'll let you know what the issue winds up being.

The drive from Katy to CS everyday sucks. Way too much time in my own head. Thank goodness for Sirius/XM!!! You gotta do what you gotta do to feed the fam though. No option to move there because of my duties as a dad. And it definatly killed my wallet. Filled up every other day.
auto zone or advance auto will read the code for free. just get the number from them and post back.
You're situation may actually justify a beater commuter car purchase. (Unless you use your truck for work)
Disconnect battery.
Trade in for car.

Code turned out to be P0449
Def: EVAP (evaporative emission system) purge/vent solenoid circuit condition

The solenoids and system wiring are monitored for opens or shorts.

Probable Cause:
-purge or vent solenoids defective
-check connector and wiring
-Fuel saturated vapor canister
-Failed EVAP vent solenoid

Was told that it could be as simple as dirty fuel system. Said change filter and put in a fuel cleaner.

anyone else have any experience with this?

[This message has been edited by mg99 (edited 8/1/2011 11:56a).]
did you run over some trash?

look on the inside frame rail for wiring harness damage
-Failed EVAP vent solenoid

By far the most common issue.
I had the failed vent selenoid issue on my 2006. I was told it was a very common issue. I was able to get it fixed at the dealer same day for ~$300.

Not really sure if that was a good price or not, but circumstances dictated that I had to have it fixed that day, and the only independent mechanic around who could have done it same day wanted upwards of $450, the rest would have had to order the kit and wait for it to be delivered, so I didn't have much choice.

Not a huge deal, just a pain. Good luck.
Isnt evap emissions components covered under the 8/80?
They are very picky about what is covered under the 8/80, most everything that's likely to fail is either in the 2/24 category or not covered at all.

From the EPA:

Design and Defect Warranty Coverage for 1995 and newer light-duty vehicles:

Emission control and emission related parts are covered for the first 2 years or 24,000 miles of vehicle use (whichever first occurs); and
Specified major emission control components are covered for the first 8 years or 80,000 miles of vehicle use (whichever first occurs).


Exhaust Gas Conversion Systems: oxygen sensor, thermal reactor, catalytic converter, dual-walled exhaust pipe
Exhaust Gas Recirculation System: EGR valve, thermal vacuum switch, EGR solenoid, EGR spacer plate, EGR backpressure transducer, sensor and switches used to control EGR flow
Evaporative Emission Control System: purge valve, fuel filler cap, purge solenoid, vapor storage canister, and filter
Positive Crankcase Ventilation (PCV) System: PCV valve, PCV solenoid
Air Injection System: Air pump diverter, bypass, or gulp valve, reed valve, anti-backfire or deceleration valve
Early Fuel Evaporative (EFE) System: EFE valve, thermal vacuum switch, heat riser valve
Fuel Metering System: electronic control module (unit) or EFI air flow meter, computer command module or mixture control unit, deceleration controls, electronic choke, fuel injectors, fuel injection units and fuel altitude compensator sensor, bars or rails for EFI or TBI systems, mixture settings on sealed fuel mixture control solenoid, diaphragm or other systems, fuel metering components that achieve closed/other feedback control sensors/loop operation switches and valves
Air Induction System: thermostatically controlled air cleaner, air box
Ignition Systems: electronic spark advance timing advance/retard systems, high energy electronic ignition
Miscellaneous Parts: hoses, gaskets, brackets, clamps, and other accessories used in the above systems


These are examples of other parts of your vehicle which have a primary purpose other than emissions control but which nevertheless have significant effects on your vehicle's emissions. If any of these parts fail to function or function improperly, your vehicle's emissions may exceed federal standards. Therefore, when any of the parts of the following systems are defective in materials or workmanship and have failed in a way that would be likely to cause your vehicle's emissions to exceed federal standards, they should be repaired or replaced under the emissions warranty:

Fuel Injection System: fuel distributor
Air Induction System: turbocharger, intake manifold
Exhaust System: exhaust manifold
Ignition System: distributor, spark plugs, ignition wires and coil
Miscellaneous Parts: hoses, gaskets, brackets, clamps, and other accessories used in the above systems.


There are three specified major emission control components, covered for the first 8 years or 80,000 miles of vehicle use (whichever first occurs) on 1995 and newer vehicles:

1. Catalytic converters.
2. The electronic emissions control unit or computer (ECU).
3. The onboard emissions diagnostic device or computer (OBD).
Finaly replaced the part that a dealer mechanic told me to replace. Time for inspection. The check engine light is still on. Does anyone know how to reset the system without unhooking the battery?
Most code readers have a reset function.
Disconnect Keep Alive Memory fuse?
If you are in an emissions county, reset it and drive it a day or two before going in for inspection. Even if the light is off, it may not have run and passed all of it's tests. When they hook up to check the ECM, it will give a list of tests and status. If any of them have not yet run and passed, the light may as well be on.
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