The check engine light is on and there is a noticeable performance issue: If you are noticing a consistent decrease in performance with the check engine light on, your vehicle may have automatically entered a "limp-mode" to prevent additional damage. The first thing we advise is confirming that it is the ‘Service Engine’ or ‘Check Engine’ light. The engine light can be triggered by a number of issues of varying degrees of severity. This is the cheapest and easiest fix. If you’re lucky, a loose or defective gas cap is the culprit. Unfortunately, the light itself doesn't tell the driver what the problem is — it could be anything from a loose cap on the gas tank to a problem with the catalytic converter. Below is a list of the top 10 reasons why your Chevy check engine light may come on. This kind of misfire can cause the catalytic converter to become damaged, so it's best to pull over as soon as possible and call for a … A mechanic can diagnose the problem that caused the check engine light to come on. But some reasons the check engine light comes on are much more common. When a malfunction is detected, the check engine light (CEL) will come on in the dashboard to let the driver know a problem has been detected. Bad or Low Octane Fuel . But why would this cause the check engine light to come on? When the engine light is lit up, and the engine control unit recognizes a problem with the engine, the engine control unit will store a … With your engine off, check your spark plug wires for tiny cracks or holes, especially around the ends of the wires. Occasionally, the check engine light comes on because of a change in humidity or other environmental factors. Likewise, the check engine light could also be a warning of a serious problem that could cause serious damage to your engine and come with a hefty repair bill. Seven of the most common problems that can cause the check engine light to come on are: A failed spark plug or ignition coil; A … If they look shabby, you should replace them. In some cases, you may not notice any symptoms at all except check engine light or service engine soon light on the dashboard. Once again, this can cause the Check Engine light to come on. So we’ll go over eight common problems that could be causing that light to come on: 1. When your check engine light comes on, this could be as simple as tightening or replacing your gas cap. The first thing you should do if the check engine light is flashing or is constant on your dashboard is to read the trouble code memory. When the Check Engine Light comes on, that means that Trouble Codes, likely identifying the causes of the issue you are having, have been stored in your car’s computer. A malfunctioning sensor, low tire pressure, low transmission fluid and so much more will cause the light to come on. Whatever the cause, failure to get your Chevy vehicle checked out when the check engine light goes on could lead to further damage meaning costlier and more invasive repairs. When your Service Engine Soon light turns on, you won’t know whether it’s because of a P0087 or a completely different issue. Often, a flashing check engine light is set off by a severe misfire in the engine that dumps unburned fuel into the exhaust system. There are a number of cars that are very sensitive to misfires. If you’re not sure, consult your owner’s manual. The fastest way to resolve this is to have a Check Engine Light Diagnostic performed to obtain those Codes and start to track down the possibilities. 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