how to reset the check engine light on GMC Sierra T1XX (2019-Present)

GMC Sierra T1XX (2019-Present)

Error Codes

15-30 minutes

Time

easy

Difficulty

medium

Severity

2 min read

386 words

Problem Statement

Learn how to reset the check engine light on GMC Sierra T1XX (2019-Present) after repairs. Step-by-step guide with diagnostic steps and safety tips.

Affected Component

Electrical

Estimated Time

15-30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' or 'Neutral' with the parking brake engaged while working on the vehicle.

Symptoms

•Check engine light illuminated on the dashboard
•Vehicle operating normally after repairs
•Error codes stored in the vehicle’s computer

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Address underlying issues indicated by the error codes
3
Check battery voltage to ensure it is in good condition

Solution

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner

Parts Required

•None specifically for the reset (only if repairs were needed originally).

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Solution

1. Preparation

Ensure that the vehicle is parked on a level surface.
Turn off the engine and remove the key from the ignition.
Gather necessary tools.

2. Connect OBD-II Scanner

Locate the OBD-II port under the dashboard on the driver’s side.
Plug in the OBD-II scanner.

3. Turn on Ignition

Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Wait for the scanner to initialize.

4. Reset the Check Engine Light

Follow the prompts on the OBD-II scanner to navigate to the “Erase Codes” or “Clear Codes” option.
Confirm the action to reset the check engine light.

5. Disconnect Scanner

Once the check engine light is reset, turn the ignition off and disconnect the scanner from the OBD-II port.

6. Test Drive

Start the engine and take the vehicle for a short drive to ensure the light does not reappear.