how to fix GMC Sierra T1XX (2019-Present) keyless entry not working?

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

560 words

Problem Statement

Learn how to diagnose and fix keyless entry issues in GMC Sierra T1XX (2019-present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shorts.

Symptoms

•Key fob does not respond when buttons are pressed
•Vehicle does not unlock or lock when approaching or moving away
•Keyless Entry Disabled message displayed on the dashboard
•Weak or dead battery in the key fob
•Intermittent operation of the keyless entry system
•Other electronic features may also be affected

Diagnostic Steps

1
Check the battery level of the key fob and replace if necessary.
2
Verify that the key fob is programmed to the vehicle using an OBD-II scanner.
3
Inspect the vehicle's door lock actuators for any mechanical failures.
4
Check for any blown fuses related to the keyless entry system in the fuse box.
5
Use a multimeter to test the keyless entry module for proper voltage and ground.
6
Examine the vehicle’s wiring harness for any signs of damage or corrosion.

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
•Multimeter
•Pliers
•Small screwdriver

Parts Required

•Key fob battery (CR2032)
•Replacement fuse (if blown)
•Keyless entry module (if faulty)

Related Faults

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Symptoms

•Key fob does not respond when buttons are pressed

•Vehicle does not unlock or lock when approaching or moving away

•Keyless Entry Disabled message displayed on the dashboard

•Weak or dead battery in the key fob

•Intermittent operation of the keyless entry system

•Other electronic features may also be affected

Diagnostic Steps

1
Check the battery level of the key fob and replace if necessary.
2
Verify that the key fob is programmed to the vehicle using an OBD-II scanner.
3
Inspect the vehicle's door lock actuators for any mechanical failures.
4
Check for any blown fuses related to the keyless entry system in the fuse box.
5
Use a multimeter to test the keyless entry module for proper voltage and ground.
6
Examine the vehicle’s wiring harness for any signs of damage or corrosion.

Solution

1. Key Fob Battery Replacement

Sub-steps:
1. Open the key fob by sliding the release button or using a small screwdriver.
2. Remove the old battery and insert a new battery (typically CR2032) with the correct polarity.
3. Reassemble the key fob and test the buttons.

2. Key Fob Reprogramming

Sub-steps:
1. Sit inside the vehicle with all doors closed.
2. Insert the key into the ignition and turn it to the "On" position without starting the engine.
3. Press and hold the "Lock" and "Unlock" buttons on the key fob simultaneously for 15 seconds.
4. Release the buttons and turn the ignition off.
5. Test the key fob to ensure functionality.

3. Fuse Inspection and Replacement

Sub-steps:
1. Locate the fuse box, which is typically found under the dashboard or in the engine compartment.
2. Identify the fuse related to the keyless entry system (refer to the fuse diagram).
3. Remove the fuse using pliers and inspect it for continuity.
4. Replace the blown fuse with one of the same amperage.
5. Retest the keyless entry system.

4. Keyless Entry Module Testing

Sub-steps:
1. Locate the keyless entry module, usually found under the dashboard or in the trunk area.
2. Disconnect the module's wiring harness and inspect for corrosion or loose connections.
3. Use a multimeter to check for proper voltage and ground at the module's connectors.
4. If faulty, replace the keyless entry module with a new one.
5. Reconnect the module and retest the system.