Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Engine light comes on I took it to the shop and they did something to the gas cap and it didn't come back on for a week and now it's back on. What do I do now?

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Take it to a shop that knows what and how to check the evaporative system on your truck.

Posted on Feb 07, 2010

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Get the OBD scanned to see what codes have been logged.

Posted on Feb 07, 2010

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Check fuel cap light coming on, replaced twice - still on. ideas?


It sounds like you have a large evap leak. The cap is most likely not the cause. You could have a hole in any numerous evap lines or in the fuel filler neck. Also the canister vent solenoid could be malfunctioning. Your best bet is to have an emissions certified shop test the system with a smoke tester. They need to have a scan tool capable of actuating the canister vent solenoid.

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looks like there is a sensor on the filler cap/lid side.
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Get gas cap from dealer as some vehicles are having issues with the after market caps. What is the actual code and what's the vehicle year, make and model?

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Check engine light comes on periodically, it does'nt change the way it runs but I am always concerned that something may be wrong.


I just had this problem with my 2005 PT Cruiser. I took the car to my local repair shop (Chrysler has abandoned this area in Florida) and had it connected to a diagnostic computer. Guess what? Loose gas cap. Looking at the cap you can see the gasket is getting funny. Repair shop recommended buying a new gas cap.

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the cigar lighter fuse usually powers the scan tool. If the light is on, take it back to the shop that did the gas cap repairs. there may be more to the leak than the gas cap.

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PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.

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2005 check engine light comes on. had advanced


If the light is out, no worries. if it comes back on and the cap is tight, there may be other problems and a qualified repair shop will need to diagnose that for you. It may have a Evaporative Emission Leak.

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CHECK ENGINE LIGHT COMES ON


My guess is you have a leak either in the fuel tank itself or in the plumbing from the cap down to the tank. Have you ever been in a wreck?

When fueling the vehicle, do you see any gas leaking out under the vehicle?

Does the area where the gas cap screws in have any damage that would allow a leak to occur?

Another area to look at is the system that recycles gas fumes back to the gas tank.

Something is not allowing the tank to hold pressure.

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make sure the gas cap is on tight. vapor recovery system depends on the closure of the gas cap. if that did not solve your problem, I would suggest to get a new gas cap first, before going to the dealer or any repair shop for a turn-up.

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