how to clear DTC codes on GMC Sierra T1XX (2019-Present) after repairs?

GMC Sierra T1XX (2019-Present)

Error Codes

10-15 minutes

Time

easy

Difficulty

medium

Severity

3 min read

428 words

Problem Statement

Learn how to clear DTC codes on GMC Sierra T1XX (2019-Present) after repairs. Step-by-step guide to reset onboard diagnostics and ensure vehicle performance.

Affected Component

Electrical

Estimated Time

10-15 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' or 'Neutral' with the parking brake engaged before starting the process.

Symptoms

•Check engine light remains illuminated
•Pending codes still present in the system
•Incorrect vehicle performance due to lingering codes
•Failure to pass emissions inspection due to active DTCs

Diagnostic Steps

1
Connect OBD-II Scanner: Locate the OBD-II port under the dashboard and connect an OBD-II scanner.
2
Turn On Ignition: Turn the vehicle's ignition to the 'ON' position without starting the engine.
3
Access Diagnostic Menu: Navigate the scanner to the 'Diagnostics' or 'Read Codes' section.
4
Read DTCs: Record any active and pending DTCs to track repairs and clear them if necessary.
5
Select Clear Codes Option: Choose the option on the scanner to clear the DTCs.
6
Confirm Code Clearance: Follow prompts on the scanner to confirm the action to clear the codes.

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

Parts Required

•None required for clearing codes

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Diagnostic Steps

1
Connect OBD-II Scanner: Locate the OBD-II port under the dashboard and connect an OBD-II scanner.
2
Turn On Ignition: Turn the vehicle's ignition to the 'ON' position without starting the engine.
3
Access Diagnostic Menu: Navigate the scanner to the 'Diagnostics' or 'Read Codes' section.
4
Read DTCs: Record any active and pending DTCs to track repairs and clear them if necessary.
5
Select Clear Codes Option: Choose the option on the scanner to clear the DTCs.
6
Confirm Code Clearance: Follow prompts on the scanner to confirm the action to clear the codes.

Solution

1. Preparation

Tools Required: OBD-II scanner
Ensure the vehicle is parked on a level surface and is in the "ON" position.

2. Clear DTCs

Connect OBD-II Scanner: Plug the OBD-II scanner into the vehicle's OBD-II port.
Power On the Scanner: Turn on the scanner and allow it to establish a connection with the vehicle's onboard computer.
Navigate to DTC Menu: Use the scanner's interface to navigate to the DTC menu.
Select Clear DTCs: Select the option to clear or erase DTCs from the system.
Confirm Action: Confirm the action when prompted by the scanner; this will reset the DTCs.
Disconnect Scanner: Safely disconnect the scanner from the OBD-II port after the codes are cleared.