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

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

410 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shocks or short circuits.

Symptoms

•Check engine light remains illuminated
•Engine performance appears normal
•No unusual noises or vibrations during operation
•No other warning lights on the dashboard

Diagnostic Steps

1
Ensure that all service and repairs have been completed properly.
2
Use an OBD-II scanner to check for any stored trouble codes.
3
Clear the trouble codes using the OBD-II scanner.
4
Disconnect the battery for a few minutes to reset the system.
5
Reconnect the battery and check if the check engine light is still illuminated.

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
•Socket wrench

Parts Required

•None required for resetting the check engine light

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Diagnostic Steps

1
Ensure that all service and repairs have been completed properly.
2
Use an OBD-II scanner to check for any stored trouble codes.
3
Clear the trouble codes using the OBD-II scanner.
4
Disconnect the battery for a few minutes to reset the system.
5
Reconnect the battery and check if the check engine light is still illuminated.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is off.
Wear safety gloves and goggles.

2. Use OBD-II Scanner

Locate the OBD-II port, typically found under the dashboard on the driver's side.
Connect the OBD-II scanner to the port.
Turn the ignition to the "ON" position without starting the engine.
Follow the scanner's instructions to read and identify any trouble codes.

3. Clear Trouble Codes

After identifying codes, navigate to the "Clear Codes" option on the scanner.
Confirm the action to clear the codes, which should turn off the check engine light.
Disconnect the scanner from the OBD-II port.

4. Battery Disconnection (Optional)

If the light remains, proceed to disconnect the battery:
- Use a socket wrench to loosen the negative battery terminal clamp.
- Remove the negative terminal and wait for 5-10 minutes to ensure all systems reset.
Reattach the negative terminal and tighten the clamp securely.