Clear check engine light on 89 GMC Suburban?

To clear the check engine light on a 1989 GMC Suburban, you can disconnect the negative battery terminal for about 10-15 minutes to reset the engine control module (ECM). Alternatively, you can use an OBD-I scanner to read and clear any trouble codes. Make sure to address any underlying issues that triggered the light before resetting it to avoid future alerts. Always consult your vehicle’s manual for specific instructions related to your model.