GMC Sierra T1XX (2019-Present) key fob not working, how to resync it?

GMC Sierra T1XX (2019-Present)

Error Codes

30-60 minutes

Time

medium

Difficulty

medium

Severity

3 min read

471 words

Problem Statement

Learn how to resync the key fob for GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

30-60 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in park and the ignition is off before starting the process.

Symptoms

•Key fob buttons unresponsive
•Unable to lock/unlock doors remotely
•No response from the vehicle when pressing the key fob
•Check engine light or security light may illuminate
•Failed to start the vehicle with key fob proximity

Diagnostic Steps

1
Verify the battery condition of the key fob by replacing it with a new one.
2
Check for any visible damage or wear on the key fob casing.
3
Attempt to start the vehicle with the key fob inside to ensure it is within range.
4
Use the OBD-II scanner to check for any relevant error codes related to the key fob or security system.
5
Try using a spare key fob (if available) to determine if the problem is with the key fob or the vehicle's receiver.

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

•Flathead screwdriver
•OBD-II scanner

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Verify the battery condition of the key fob by replacing it with a new one.
2
Check for any visible damage or wear on the key fob casing.
3
Attempt to start the vehicle with the key fob inside to ensure it is within range.
4
Use the OBD-II scanner to check for any relevant error codes related to the key fob or security system.
5
Try using a spare key fob (if available) to determine if the problem is with the key fob or the vehicle's receiver.

Solution

1. Preparation

Gather required tools and parts.
Ensure the vehicle is in a secure location with the ignition off.

2. Replace Key Fob Battery

Open the key fob by using a small flathead screwdriver to pry it apart.
Remove the old battery and replace it with a new CR2032 battery, ensuring correct polarity.
Reassemble the key fob securely.

3. Resync the Key Fob with the Vehicle

Enter Programming Mode:
- Sit in the driver’s seat with all doors closed.
- Insert the key into the ignition and turn it to the "On" position (do not start the engine).
Activate Programming Sequence:
- Press the "Lock" button on the driver’s door panel for about 5 seconds until the locks cycle (lock then unlock).
- Press and hold the "Unlock" button on the key fob for about 15 seconds.
Finalize the Sync:
- Turn the ignition to the "Off" position and remove the key.
- Test the key fob by pressing the lock/unlock buttons to ensure it functions correctly.

4. Test Vehicle Response

Ensure the vehicle responds to the key fob inputs (lock/unlock and starting if applicable).