GMC Sierra T1XX (2019-Present) remote start not working how to fix it

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

554 words

Problem Statement

Learn how to diagnose and fix the remote start issue in GMC Sierra T1XX (2019-present). Step-by-step guide with symptoms, diagnostic steps, and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shorts

Symptoms

•Remote start button does not respond when pressed
•Engine fails to start remotely
•Check engine light may be illuminated
•Security light remains on or flashes
•Vehicle starts normally using the key or key fob
•No audible confirmation (horn honk) when attempting to remote start

Diagnostic Steps

1
Verify that the vehicle is in a suitable condition for remote starting (e.g., doors closed, hood closed, and brake pedal not pressed)
2
Check the battery voltage of the key fob to ensure it is functioning properly
3
Inspect the vehicle’s key fob for physical damage or wear
4
Scan the vehicle’s computer system using an OBD-II scanner for any diagnostic trouble codes (DTCs) related to the remote start system
5
Examine the vehicle’s security system to ensure it is not disabling the remote start feature
6
Inspect the vehicle’s fuses related to the remote start system for any blown fuses

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
•Small flathead screwdriver
•Fuse puller or needle-nose pliers

Parts Required

•Replacement key fob battery
•Replacement fuses (if needed)

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Diagnostic Steps

1
Verify that the vehicle is in a suitable condition for remote starting (e.g., doors closed, hood closed, and brake pedal not pressed)
2
Check the battery voltage of the key fob to ensure it is functioning properly
3
Inspect the vehicle’s key fob for physical damage or wear
4
Scan the vehicle’s computer system using an OBD-II scanner for any diagnostic trouble codes (DTCs) related to the remote start system
5
Examine the vehicle’s security system to ensure it is not disabling the remote start feature
6
Inspect the vehicle’s fuses related to the remote start system for any blown fuses

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked safely and is turned off.
Disconnect the battery to prevent any electrical shorts during repairs.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver
Sub-steps:
1. Use the flathead screwdriver to carefully pry open the key fob casing.
2. Remove the old battery, noting the orientation.
3. Insert the new battery in the same orientation.
4. Snap the fob casing back together securely.

3. Check and Replace Fuses

Tools Required: Fuse puller or needle-nose pliers
Sub-steps:
1. Locate the fuse box, usually found under the dashboard or near the engine bay.
2. Identify the fuses related to the remote start system (consult the owner’s manual).
3. Pull the fuses out one by one and inspect for any blown fuses.
4. Replace any blown fuses with new fuses of the same amperage.

4. Reprogram Key Fob (if necessary)

Tools Required: OBD-II scanner with key fob programming capability
Sub-steps:
1. Connect the OBD-II scanner to the vehicle’s diagnostic port.
2. Follow the scanner’s prompts to access the key fob programming menu.
3. Program the key fob according to the scanner instructions.
4. Test the remote start feature after reprogramming.

5. Reconnect Battery

Reconnect the battery terminals and ensure they are tight.
Start the vehicle normally to ensure all systems are functioning.