Question about 2007 GMC Sierra 1500

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Dealer states emmision problem $322.00 to repair;

Engine light off and on, mostly on, but goes off from time to time; dealer states emmision problem $322.00 to repair; if not repaired, what damage might occur

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Your leaking gas fumes into the atmosphere. Its a health risk. All cars leak a little. Even new ones. Your leak is larger than your computer will allow. If the mechanic did not recommend a new fuel cap that would be my first choice since you can do that yourself for about 10 bucks.

Posted on May 10, 2010

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You mean check engine light? If so, the P0456 code is an emmisions leak code. You will need to take the vehicle to a qualified repair facility and have them run an emmisions leakage test on it.

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Check engine lights are used to mostly indicate problems with emission controlling components. Check your pcv valve, egr, map sensors maf sensors or any emmision related component

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If the timing belt keeps breaking and bending valves, the timing belt and cylinder head repair is not being done correctly. It's as simple as that. Are you changing the tensioner and idler pullies when replacing the belt? Is it timed correctly? Was the timing belt tension adjusted properly? Were the cam journals checked for damage? If not, you are asking for another belt failure.

If you want to know why the check engine light is coming on, you will have to ask your engine computer. Every time the light comes on it is storing a fault code to tell you why. You must scan your engine control module to retrieve the fault code(s) so you can get it properly diagnosed and repaired.

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There is a continuing problem occuring. You need to hook up an OB11 meter to the port under the dash to access the info needed to make the necessary repair. Often it is a simple thing like a leaking gas cap i.e. an emmisions code. OB11's are relatively cheap from $50-$300. Bottom end ones will work fine. Good luck!

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Engine light remains on.

Their is a fault with the electronics on the engine. This will bring up the engine light, you will need to see a dealer with an electronics reader to find out what this fault code. Most dealers will read it for free, and then charge for the repair from that point. If it is an orange light, just get it to a dealer when you are able to. If it is a red light, avoid driving it and get to a dealer ASAP. this will prevent any possible engine damage.

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I just bought an audi A4 ffrom a dealer last night. we checked everything before buying it and compared different audis. we chose the one at the dealer because the other one we looked at from a private...

it can be many things. You will need to have the ECU scanned with an OBD2 scan tool. This will retrieve the code that has been set by the ECU. This code will not tell you what part is defective but will tell you what part is being effected. If you just bought the car my advice would be to take it back to the selling dealer and have them repair it. In most states a dealer must give you a 30 day warranty on the emissions system. It may be the dealer reset the check engine light and knew about this all along. It would then take a few driving cycles for the light to come back on. I am not saying they did this but it is possible. The bottom line is that you will have to have the ECU scanned and then a trained professional can use that code to know where to start looking for the problem. It is not easy for a novice to know what to replace especially if the car is running good. The scan will tell you where to look. I would pursue the selling dealer for the repair. If he refuses, then contact your state attorney general to see what the law is concerning this in your state.

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How do i turn off a check engine light on my 2007 gmc yukon

The dealer will have to do this for you. If you had a problem and it is fixed, the light will go out after several days of use, if the light doesn't go out after a while, then you still have a problem and the dealer will have to help you read the codes and come up with a solution. Most of the time a check engine light will be set off by faulty emmission sensors, or some type of failure in the emmision controls.

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The warning light has two states. A blinking light indicates a critical problem with gaseous emissions from the engine that is likely to cause permenant damage to the engine, exhaust sytem or catalytic converter. A blinking light must be remedied immediately, and the car should not be driven in this state, at the risk of causing serious and permenant damage to the engine, exhaust and/or catalytic converter. Repairing or replacing these parts can be extremely expensive. A reputable garage or a Vauxall/Opel garage should be able to diagnose and repair the problem.

A solid (unblinking) light indicates a non-critical fault in the emmisions exhaust system. Many faults are covered by this light including failures in emssions sensors, temperature sensors and a variety of other parts. This usually results in a higher than average amount of environmentally harmful pollutants being expelled from the car, loss of power and/or gradual damage to the engine, exhaust and catalytic converter. While the car can still be driven with a non-critical emmisions problem, it is highly recommended that the fault is diagnosed and repaired at a reputable garage or Vauxhall/Opel garage.

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well this old trick might work.disconnect your battery for about 5 minutes and hook it back up,that work for me.or you can take it to an autozone and they have a code reader to read and turn off the engine light.let me if the check engine light is on it wont pass emissions.

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