How do you turn the engine light off in your 2001 GMC Sierra truck?

The check engine light (CEL) in your 2001 GMC Sierra truck is an indicator of a problem with the vehicle's engine or emissions control system. It is not recommended to turn off the CEL without first addressing the underlying issue, as this could lead to further damage or potentially dangerous conditions while driving.

If you believe that the CEL is illuminated due to a minor or temporary issue, such as a loose gas cap, you may attempt to reset it by following these steps:

1.Ensure that the vehicle is parked safely and the engine is turned off.

2.Locate the OBD-II (On-Board Diagnostics) port in your vehicle. This is typically found under the dashboard, near the driver's side footwell.

3.Connect an OBD-II scanner to the port. These scanners are available at auto parts stores or online.

4.Turn the key in the ignition to the "On" position (without starting the engine).

5.Follow the instructions provided with the OBD-II scanner to access the vehicle's diagnostic information and clear the CEL.

If the CEL remains illuminated after following these steps, or if it comes back on after a short period of time, it is recommended to take your truck to a qualified mechanic for further diagnosis and repair. Ignoring the CEL could lead to more serious issues down the road.