Chevrolet Check Engine Light On

Is your Chevrolet Check Engine Light (CEL) ON? Don't panic! In this guide, you will learn about some of the most common problems that can trigger the check engine light to come on. You will also find step by step instructions on how to read and clear Chevrolet check engine light. 

chevrolet check engine light onChevrolet check engine light may also be referred to as Malfunction Indicator Lamp. It is only supposed to be on for a few seconds when you start the car. After the engine starts the check engine light should turn off.

If your Chevrolet check engine light stays when the engine is running, it means that the vehicle has detected a problem and stored a fault code on the main computer (known as Engine Control Unit / ECU). Reading those codes if the first troubleshooting step that you or your mechanic needs to perform. 

Symptoms

Symptoms of a check engine light can vary depending on the fault code that triggered the light. Possible symptoms include:

  • Poor throttle response
  • A decrease in fuel economy
  • Engine misfire
  • Difficult to accelerate or going uphill
  • Engine shakes or excessive vibrations
  • Car won't stay running

The check engine light may be on, with no symptoms. Even if there are no symptoms it is important to read the fault codes to find out why CEL is on.

How to read/clear Chevrolet check engine light

Follow the instructions below to read Chevrolet service engine light codes.

What you will need

Instructions

Step 1

Locate OBD-2 port under the dashboard of your Chevrolet on the driver's side. This is a 16-pin port and all 1996 and newer Chevrolet vehicles have this port.

 

Step 2

Plug in your OBD2 scanner or Bluetooth adapter into the OBD2 port.

Chevrolet  Check Engine Light ON Troulbeshooting

 

Step 3

Turn ignition ON, key in position II. All Chevrolet dashboard lights will turn on but do not start the engine. If your Chevrolet has Start/Stop button you will need to press the START button without pressing the brakes.

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Step 4

Allow your OBD2 scanner to turn on and connect to your Chevrolet Engine Control Unit (ECU). This step can take up to one minute.

Check Engine Light On Chevrolet

 

Step 5

Read Chevrolet check engine light codes from the Engine Control Unit (ECU)  using an OBD-II scanner.

Step 6

Once you have retrieved the codes, write them down. Research the codes and fix the underlying problem, you can come back to reset Chevrolet check engine light.

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Reset Chevrolet Check Engine Light

  1. Plug in the scanner into OBD-II port.
  2. Allow scanner to turn on and connect to ECU.
  3. Read fault codes first.
  4. Go to Erase Codes menu.
  5. Select YES to clear Chevrolet check engine light.