how to troubleshoot key fob not working on GMC Sierra T1XX (2019-Present)?

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

497 words

Problem Statement

Learn how to troubleshoot and fix a non-functioning key fob for GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Be cautious when handling the vehicle battery; wear gloves and eye protection if necessary.

Symptoms

•Key fob buttons unresponsive
•Vehicle does not respond to key fob signals
•Check engine or security light illuminated on the dashboard
•Manual key operation works but remote features do not
•Battery warning for key fob displayed (if equipped)

Diagnostic Steps

1
Inspect the key fob battery for corrosion and replace if necessary.
2
Check for any visible damage to the key fob casing or buttons.
3
Attempt to reprogram the key fob using the vehicle's programming mode.
4
Verify the vehicle's battery voltage and ensure it is at an acceptable level.
5
Scan the vehicle's onboard computer with an OBD-II scanner for any related error codes.
6
Test a spare key fob (if available) to determine if the issue is with the fob or the vehicle.

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
•Multimeter
•OBD-II scanner

Parts Required

•Key fob battery (CR2032 or similar)

Related Faults

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Diagnostic Steps

1
Inspect the key fob battery for corrosion and replace if necessary.
2
Check for any visible damage to the key fob casing or buttons.
3
Attempt to reprogram the key fob using the vehicle's programming mode.
4
Verify the vehicle's battery voltage and ensure it is at an acceptable level.
5
Scan the vehicle's onboard computer with an OBD-II scanner for any related error codes.
6
Test a spare key fob (if available) to determine if the issue is with the fob or the vehicle.

Solution

1. Preparation

Gather tools: flathead screwdriver, multimeter (for battery testing), new key fob battery (typically CR2032 or similar), OBD-II scanner.
Ensure the vehicle is parked, and the ignition is turned off.

2. Battery Replacement

Remove the Key Fob Case:
- Use a flathead screwdriver to gently pry open the key fob casing.
Replace the Battery:
- Remove the old battery and test its voltage with a multimeter.
- Install the new battery, ensuring the positive (+) side is facing the correct direction.
Reassemble the Key Fob:
- Snap the key fob casing back together until secure.

3. Reprogram the Key Fob

Access Programming Mode:
- Insert the key into the ignition and turn it to the "ON" position without starting the engine.
Perform the Reprogramming Sequence:
- Press the "Lock" and "Unlock" buttons simultaneously for 15 seconds.
- Press the "Lock" button again to finalize the programming process.
Test the Key Fob:
- Try locking and unlocking the vehicle doors with the fob.

4. Check Vehicle Battery

Inspect Battery Condition:
- Open the hood and visually check the battery terminals for corrosion.
Test Battery Voltage:
- Use a multimeter to measure the battery voltage; it should be around 12.6 volts or more for a fully charged battery.