my GMC Sierra T1XX (2019-Present) key fob won't unlock the doors, what to do

GMC Sierra T1XX (2019-Present)

Error Codes

1 hour

Time

medium

Difficulty

medium

Severity

3 min read

489 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on any vehicle electrical systems if necessary.

Symptoms

•Key fob buttons do not respond
•Vehicle does not unlock when approaching with the key fob
•Indicator lights on the key fob do not illuminate
•Manual key insert does not unlock the doors
•Check engine or key fob warning light illuminated on the dashboard

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Replace the battery in the key fob and test the functionality.
3
Inspect the key fob for physical damage or wear, including cracks or broken buttons.
4
Attempt to reprogram the key fob according to the vehicle’s manual.
5
Scan for any error codes using an OBD-II scanner that may indicate an issue with the vehicle's electronic systems.
6
Test the vehicle's receiver module by attempting to unlock the doors using the physical key.

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

•CR2032 key fob battery

Related Faults

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Replace the battery in the key fob and test the functionality.
3
Inspect the key fob for physical damage or wear, including cracks or broken buttons.
4
Attempt to reprogram the key fob according to the vehicle’s manual.
5
Scan for any error codes using an OBD-II scanner that may indicate an issue with the vehicle's electronic systems.
6
Test the vehicle's receiver module by attempting to unlock the doors using the physical key.

Solution

1. Preparation

Tools Required: Flathead screwdriver, new key fob battery (usually CR2032), OBD-II scanner.
Ensure the vehicle is in a safe, well-lit area and has sufficient battery power.

2. Replace Key Fob Battery

Use a flathead screwdriver to gently pry open the key fob casing.
Remove the old battery and replace it with a new one (ensure correct polarity).
Reassemble the key fob casing and test the buttons to see if they respond.

3. Reprogram Key Fob

Sit in the driver's seat and close all doors.
Insert the key into the ignition and turn it to "On" (not starting the engine) and back to "Off" five times within 10 seconds.
Listen for a chime indicating that the vehicle is in programming mode.
Press the lock button on the key fob to program it. Wait for a confirmation chime.
Turn the ignition to "Off" to exit programming mode.

4. Inspect Receiver Module

Tools Required: OBD-II scanner.
Connect the OBD-II scanner to the vehicle's diagnostic port.
Scan for error codes related to the keyless entry system or other electronic systems.
Follow the manufacturer's instructions for resolving any identified issues.