GMC Sierra T1XX (2019-Present) key fob not working how to reprogram

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

438 words

Problem Statement

Learn how to reprogram the key fob for GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic steps and tools required for successful reprogramming.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in park and the engine is off during reprogramming.

Symptoms

•Key fob buttons unresponsive
•Vehicle not recognizing the key fob
•Unable to lock or unlock doors remotely
•Engine not starting with the key fob present
•Dashboard showing 'Key Not Detected' warning

Diagnostic Steps

1
Check the battery in the key fob for power.
2
Replace the battery if necessary and test the key fob again.
3
Verify that the key fob is within range of the vehicle.
4
Attempt to manually unlock the door with the physical key to ensure the vehicle's locking system is functioning.
5
Consult the vehicle’s owner's manual for specific reprogramming instructions if the fob still does not work.

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
•Flathead screwdriver

Parts Required

•Replacement key fob battery

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Diagnostic Steps

1
Check the battery in the key fob for power.
2
Replace the battery if necessary and test the key fob again.
3
Verify that the key fob is within range of the vehicle.
4
Attempt to manually unlock the door with the physical key to ensure the vehicle's locking system is functioning.
5
Consult the vehicle’s owner's manual for specific reprogramming instructions if the fob still does not work.

Solution

1. Preparation

Tools Required:
- OBD-II scanner (if needed for advanced programming)
- Flathead screwdriver (to open the key fob)
Ensure all doors are closed and the vehicle is in park.
Have a working spare key fob available for reference if necessary.

2. Reprogram Key Fob

Insert Key into Ignition:
- Insert the key into the ignition and turn it to the "On" position without starting the engine.
Cycle the Ignition:
- Turn the key from "On" to "Off" and back to "On" twice. Leave the key in the "On" position on the second cycle.
Programming Mode:
- The vehicle's locks should cycle, indicating it is in programming mode. If not, repeat the ignition cycling step.
Program the Key Fob:
- Press and hold any button on the key fob for approximately 15 seconds. The locks should cycle again, indicating successful programming.
Exit Programming Mode:
- Turn the ignition off and remove the key. Test the key fob to ensure it is functioning correctly.