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

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes

Time

easy

Difficulty

medium

Severity

2 min read

398 words

Problem Statement

Learn how to reset the check engine light on a 2019-present GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and reset instructions.

Affected Component

Engine

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a safe location before performing any diagnostics
•Be cautious of any electrical components while connecting the OBD-II scanner

Symptoms

•Check engine light illuminated on the dashboard
•Possible stored diagnostic trouble codes (DTCs) in the engine control unit (ECU)
•No noticeable performance issues if the light is due to a non-critical fault

Diagnostic Steps

1
Use an OBD-II scanner to read any stored diagnostic trouble codes (DTCs)
2
Address any underlying issues indicated by the codes before attempting a reset
3
Check the vehicle’s owner manual for specific reset instructions or confirmation of fault resolution

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
•Ignition key

Parts Required

•None for the reset process

Related Faults

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Solution

1. Preparation

Gather necessary tools: OBD-II scanner, ignition key.
Ensure the vehicle is parked on a level surface and the engine is turned off.

2. Connect the OBD-II Scanner

Locate the OBD-II port under the dashboard near the driver's seat.
Plug in the OBD-II scanner and turn the ignition key to the "ON" position without starting the engine.

3. Read and Clear Codes

Follow the prompts on the scanner to read any stored DTCs.
If there are codes, note them for reference.
Navigate to the option to clear or reset the codes on the scanner and select that option.

4. Disconnect the Scanner

Once the codes are cleared, safely disconnect the OBD-II scanner from the port.
Turn off the ignition.

5. Test the System

Start the engine and allow it to run for a few minutes.
Monitor the dashboard to ensure the check engine light does not re-illuminate.