How to get check engine light off on gm cars

The often misunderstood check engine light or "service engine soon" message can mean many different things.

How to Reset a GM Check Engine Light

It could be a misfiring engine, a broken oxygen sensor or simply a loose gas cap. When you see the check engine light it doesn't necessarily mean you need to pull the car over to the side of the road and call a tow truck.

It does mean you should get the car checked out as soon as possible. If you ignore the warning, you could end up causing further damage. It could also be a sign that you're getting poor fuel economy and emitting high levels of pollutants.

Diagnostic of "Service Engine Soon" for a 2000 GMC Sierra 1500 Oxygen Sensor PO138 PO300

In any case, if the check engine light is on in your car, it's time to schedule a service appointment. At our service center, we have factory-trained technicians who can easily check and diagnose what's behind your check engine light message, at a cost that is nearly always lower than a private garage.


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If you're check engine light is on and you're in need of a diagnosis, contact our service department for a fast and cost efficient solution. What to do when your check engine light comes on It should also give you a tour of the other gauge and warning indicators on your dashboard. If your check engine light is on, the first thing to do is look for a serious problem that requires immediate attention.

Why is the Check Engine Light on in My Chevrolet Vehicle?

Check your dashboard gauges and lights for indications of low oil pressure or overheating. These conditions mean you should pull over and shut off the engine as soon as you can find a safe place to do so.


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On some cars, a yellow "check engine" means investigate the problem, while a red "check engine" means stop right now. Reconnect the negative battery terminal and start the vehicle. The light should be out.

How to Reset a Check Engine Light

If it is not out, or comes back on, take the vehicle to a mechanic to have the computer scanned for trouble codes. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Step 1 Turn the vehicle off if it is running.

Step 2 Open the hood to the car or truck and locate the vehicle battery. Step 3 Remove the negative terminal from the battery by loosing the bolt on the cable end.


  • How to Clear the Service Engine Light on a GM Car.
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Step 4 Cover the cable end with the dry wash cloth and place away from the battery post. Step 5 Allow the vehicle to sit for 10 minutes. Items you will need Wrench to fit the battery terminal bolt. Dry wash cloth.

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