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

3 min read

408 words

Problem Statement

Learn how to reset the check engine light on GMC Sierra T1XX (2019-Present) with our step-by-step guide. Ensure your vehicle runs smoothly.

Affected Component

Engine

Estimated Time

15-30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in park with the ignition turned off before connecting or disconnecting the OBD-II scanner.

Symptoms

•Check engine light illuminated on the dashboard
•Potentially stored trouble codes in the vehicle's computer
•Engine performance issues may have been previously experienced

Diagnostic Steps

1
Use an OBD-II scanner to check for stored trouble codes.
2
Address any identified issues that triggered the check engine light.
3
Confirm that all repairs or adjustments have resolved the problem before resetting the light.

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 for the reset process, but any required repairs based on trouble codes should be addressed.

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Solution

1. Preparation

Ensure the vehicle is parked on a level surface with the ignition turned off.
Gather necessary tools including an OBD-II scanner.

2. Connect OBD-II Scanner

Locate the OBD-II port under the dashboard, typically near the driver's side.
Plug the OBD-II scanner into the port.
Turn the ignition to the "On" position (do not start the engine).

3. Read and Clear Codes

Power on the OBD-II scanner and follow the prompts to access the vehicle's diagnostic information.
Select the option to read trouble codes and take note of them for reference.
Once issues are resolved, select the option to clear or erase trouble codes.
Confirm the action when prompted by the scanner.

4. Disconnect Scanner

Safely remove the OBD-II scanner from the port.
Ensure that the ignition is turned off before disconnecting.

5. Test the Vehicle

Start the engine and observe if the check engine light remains off.
Allow the engine to idle for a few moments, checking if any warning lights reappear.