why is my GMC Sierra T1XX (2019-Present) remote key not unlocking the doors?

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

501 words

Problem Statement

Learn how to diagnose and fix the remote key not unlocking doors on your GMC Sierra T1XX (2019-present). Step-by-step guide with symptoms and solutions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is off and in a secure location while working on the key fob.

Symptoms

•Remote key does not unlock doors when pressed
•Key fob LED indicator does not light up
•Difficulty starting the vehicle when using the key fob
•Other electronic functions (such as remote start) also malfunction
•Physical key access works but not the remote function

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Check the battery in the key fob and replace if necessary.
3
Test the key fob frequency using an OBD-II scanner or a key fob tester.
4
Verify vehicle battery voltage to ensure it is not low.
5
Check for any blown fuses related to the central locking system.
6
Re-sync the key fob with 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

•Small screwdriver
•Multimeter
•OBD-II scanner

Parts Required

•CR2032 battery (replacement)

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Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Check the battery in the key fob and replace if necessary.
3
Test the key fob frequency using an OBD-II scanner or a key fob tester.
4
Verify vehicle battery voltage to ensure it is not low.
5
Check for any blown fuses related to the central locking system.
6
Re-sync the key fob with the vehicle.

Solution

1. Preparation

Gather necessary tools: small screwdriver, multimeter, replacement battery (CR2032), and OBD-II scanner.
Ensure the vehicle is in a safe environment and the engine is off.

2. Inspect Key Fob

Remove the key fob cover using a small screwdriver.
Inspect for any visible damage such as cracks or broken components.
Check the battery compartment for corrosion.

3. Replace Battery

If the battery is dead or weak, replace it with a new CR2032 battery.
Ensure the battery is inserted correctly, aligning the positive and negative terminals.

4. Test Key Fob Functionality

Use a multimeter to test the new battery voltage (should be around 3 volts).
Reassemble the key fob and press the unlock button to see if it functions.

5. Re-synchronize Key Fob

Sit in the vehicle and close all doors.
Insert the key into the ignition and turn to the "On" position without starting the engine.
Press and hold the "Unlock" button on the key fob for approximately 10 seconds.
While holding the "Unlock" button, press the "Lock" button three times.
Release the "Unlock" button and turn the ignition off; the key fob should be re-synchronized.