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

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

414 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a safe environment before performing the reset
•Disconnect the battery if working on electrical systems after diagnosing issues

Symptoms

•Check engine light illuminated on the dashboard
•Possible stored DTCs in the vehicle's computer
•Engine may run fine but warning light remains on
•Intermittent warning light may appear during driving

Diagnostic Steps

1
Use an OBD-II scanner to retrieve and record any diagnostic trouble codes (DTCs)
2
Determine if the DTCs indicate a temporary issue or a persistent fault
3
Address any underlying issues indicated by the DTCs before resetting the light

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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 (unless addressing underlying issues indicated by DTCs)

Related Faults

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Solution

1. Preparation

Gather tools and materials needed for the reset.
Ensure the vehicle is parked in a safe area with the ignition turned off.

2. Connect OBD-II Scanner

Locate the OBD-II port under the dashboard, near the driver's seat.
Plug the OBD-II scanner into the port.
Turn the vehicle's ignition to the "ON" position without starting the engine.

3. Retrieve Codes

Follow the on-screen prompts on the OBD-II scanner to retrieve any stored DTCs.
Note down the codes for reference.

4. Clear Codes

Use the scanner's function to clear or reset the DTCs.
Confirm the action on the scanner when prompted.

5. Disconnect Scanner

Remove the OBD-II scanner from the port.
Turn the ignition off and wait for a few seconds before turning it back on.

6. Test Drive

Start the engine and take the vehicle for a short test drive.
Monitor the dashboard for the return of the check engine light.