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

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

442 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' and the ignition is off before working on electrical systems.

Symptoms

•Check engine light illuminated
•Possible previous diagnostic trouble codes (DTCs) stored
•Engine may run normally or exhibit no noticeable symptoms
•Recent repairs or maintenance performed (if applicable)
•Fuel efficiency may appear affected (if issues persist)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any underlying issues.
2
Address any specific codes or issues found before attempting to reset the light.
3
Disconnect the negative battery terminal for at least 15 minutes to reset the ECU.
4
Reconnect the battery terminal and ensure a secure connection.
5
Start the vehicle and check if the check engine light remains off.

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 set
•Wrench set

Parts Required

•None required for reset; however, address any underlying issues as indicated by error codes.

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any underlying issues.
2
Address any specific codes or issues found before attempting to reset the light.
3
Disconnect the negative battery terminal for at least 15 minutes to reset the ECU.
4
Reconnect the battery terminal and ensure a secure connection.
5
Start the vehicle and check if the check engine light remains off.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, wrench set.
Ensure the vehicle is parked on a level surface and the engine is off.
Gather the necessary tools and components.

2. Scan for Error Codes

Connect the OBD-II scanner to the vehicle’s diagnostic port located under the dashboard.
Turn the ignition key to the "ON" position without starting the engine.
Read and record any stored error codes indicated by the scanner.

3. Disconnect Battery

Using a socket or wrench, loosen the nut on the negative battery terminal.
Carefully remove the negative cable from the terminal and ensure it does not touch any metal parts.

4. Reset ECU

Wait for at least 15 minutes to allow any residual charge to dissipate.
Reconnect the negative battery terminal and tighten the nut securely.

5. Verify Reset

Start the vehicle and monitor the dashboard for the check engine light.
If the light is off, the reset was successful.