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

GMC Sierra T1XX (2019-Present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

514 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

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shocks or shorts.

Symptoms

•Key fob buttons unresponsive
•Vehicle does not unlock/lock with key fob
•Engine does not start using the key fob
•Weak or intermittent signal from key fob
•LED indicator on key fob not lighting up

Diagnostic Steps

1
Check the battery in the key fob for proper voltage using a multimeter.
2
Inspect the key fob for physical damage, such as cracks or broken components.
3
Verify that the vehicle’s battery is fully charged and in good condition.
4
Test the key fob's signal range by standing closer to the vehicle.
5
Scan the vehicle for any error codes related to the keyless entry system using an OBD-II scanner.

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

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Diagnostic Steps

1
Check the battery in the key fob for proper voltage using a multimeter.
2
Inspect the key fob for physical damage, such as cracks or broken components.
3
Verify that the vehicle’s battery is fully charged and in good condition.
4
Test the key fob's signal range by standing closer to the vehicle.
5
Scan the vehicle for any error codes related to the keyless entry system using an OBD-II scanner.

Solution

1. Preparation

Gather all tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the vehicle battery to avoid any electrical shorts.

2. Replace Key Fob Battery

Sub-step 1: Open the key fob casing using a flathead screwdriver, gently prying it apart at the seam.
Sub-step 2: Remove the old battery and note its orientation (usually a CR2032 battery).
Sub-step 3: Insert the new battery in the same orientation.
Sub-step 4: Snap the key fob casing back together securely.

3. Reprogram Key Fob (if necessary)

Sub-step 1: Insert the key into the ignition and turn it to the "On" position without starting the engine.
Sub-step 2: Press and hold the "Lock" and "Unlock" buttons on the key fob simultaneously for about 15 seconds.
Sub-step 3: Release the buttons, then press the "Lock" button again to finalize the programming.
Sub-step 4: Turn the ignition off and test the key fob functions.

4. Check Vehicle Keyless Entry System

Sub-step 1: Inspect the keyless entry antenna located in the vehicle for any signs of damage or disconnection.
Sub-step 2: Ensure the vehicle's wiring harness connected to the keyless entry system is secure.
Sub-step 3: If issues persist, consult the vehicle’s service manual for specific troubleshooting steps related to the keyless entry module.