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

GMC Sierra T1XX (2019-Present)

Error Codes

15-30 minutes

Time

easy

Difficulty

medium

Severity

2 min read

400 words

Problem Statement

Learn how to reset the check engine light in GMC Sierra T1XX (2019-Present) with step-by-step instructions and diagnostic procedures.

Affected Component

Electrical

Estimated Time

15-30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in park and the engine is off before connecting or disconnecting the OBD-II scanner.

Symptoms

•Check engine light illuminated on the dashboard
•Possible stored DTCs in the vehicle’s computer
•Engine running normally after repairs or maintenance
•No discernible performance issues

Diagnostic Steps

1
Scan the vehicle's OBD-II system using an OBD-II scanner to check for DTCs.
2
Note any error codes and their descriptions to ensure all issues are resolved before resetting.
3
Clear the DTCs using the OBD-II scanner to reset the check engine 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 (assuming previous issues are resolved)

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Solution

1. Preparation

Gather tools and equipment.
Ensure the vehicle is parked on a level surface and the ignition is turned off.

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 securely.

3. Turn Ignition On

Turn the vehicle's ignition to the "On" position without starting the engine. This powers the OBD-II scanner.

4. Access Diagnostic Codes

Follow the scanner's prompts to access the vehicle's diagnostic codes.
Review the error codes and ensure all necessary repairs have been completed.

5. Clear Codes

Select the option to "Clear Codes" or "Erase Codes" on the scanner.
Confirm the action when prompted to reset the check engine light.

6. Disconnect Scanner

Once codes are cleared, safely disconnect the OBD-II scanner from the port.
Turn the ignition off and then back on to verify that the check engine light is no longer illuminated.