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

GMC Sierra T1XX (2019-Present)

Error Codes

15-30 minutes

Time

easy

Difficulty

medium

Severity

2 min read

398 words

Problem Statement

Learn how to reset the check engine light on your GMC Sierra T1XX (2019-present) with step-by-step instructions and necessary tools.

Affected Component

Electrical

Estimated Time

15-30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always ensure the vehicle is turned off before connecting or disconnecting the OBD-II scanner.
•Disconnect the battery carefully to avoid short circuits.

Symptoms

•Check engine light illuminated
•Engine running normally (no noticeable performance issues)
•Recent maintenance or repairs performed
•Error codes may have been cleared with a scanner

Diagnostic Steps

1
Use an OBD-II scanner to check for any stored error codes.
2
Clear the error codes using the OBD-II scanner.
3
Disconnect the negative battery terminal for 5-10 minutes as an alternative reset method.
4
Reconnect the battery terminal and ensure it is tight.
5
Start the engine to verify if the check engine light has turned off.

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
•Wrench

Parts Required

•None (this procedure does not typically require replacement parts)

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Diagnostic Steps

1
Use an OBD-II scanner to check for any stored error codes.
2
Clear the error codes using the OBD-II scanner.
3
Disconnect the negative battery terminal for 5-10 minutes as an alternative reset method.
4
Reconnect the battery terminal and ensure it is tight.
5
Start the engine to verify if the check engine light has turned off.

Solution

1. Preparation

Gather necessary tools: OBD-II scanner and a wrench (if using the battery disconnect method).
Ensure the vehicle is parked on a flat surface with the engine off.

2. Using OBD-II Scanner

Locate the OBD-II port under the dashboard, usually near the driver's side.
Plug the OBD-II scanner into the port.
Turn the ignition key to the "ON" position without starting the engine.
Follow the scanner's prompts to retrieve error codes.
Once the codes are displayed, select the option to clear or erase codes.

3. Disconnecting Battery Terminal (if applicable)

Using a wrench, locate and loosen the negative battery terminal (usually black).
Remove the negative cable from the battery post and ensure it does not touch the terminal.
Wait for 5-10 minutes to allow the vehicle’s computer to reset.
Reattach the negative cable securely to the battery post.