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

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

535 words

Problem Statement

Learn how to diagnose and fix the remote start issue on 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 the battery before working on any electrical components to prevent short circuits.

Symptoms

•Remote start button does not respond when pressed
•Vehicle does not start or show any signs of attempting to start
•Dashboard lights do not illuminate when remote start is activated
•No audible confirmation (horn honk or lights flashing) upon pressing the remote start button
•Possible 'Service Theft Deterrent System' warning displayed on the dashboard

Diagnostic Steps

1
Check the vehicle's battery voltage to ensure it is not low.
2
Verify that the key fob battery is functional and replace if necessary.
3
Inspect the remote start system settings in the vehicle's infotainment system.
4
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
5
Ensure that the vehicle is in a suitable condition for remote start (e.g., doors closed, hood closed, brake pedal not pressed).
6
Test the remote start feature with a second key fob to rule out a malfunctioning fob.

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
•Flat-head screwdriver
•Multimeter

Parts Required

•Key fob battery (CR2032 or equivalent)

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Symptoms

•Remote start button does not respond when pressed

•Vehicle does not start or show any signs of attempting to start

•Dashboard lights do not illuminate when remote start is activated

•No audible confirmation (horn honk or lights flashing) upon pressing the remote start button

•Possible 'Service Theft Deterrent System' warning displayed on the dashboard

Diagnostic Steps

1
Check the vehicle's battery voltage to ensure it is not low.
2
Verify that the key fob battery is functional and replace if necessary.
3
Inspect the remote start system settings in the vehicle's infotainment system.
4
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
5
Ensure that the vehicle is in a suitable condition for remote start (e.g., doors closed, hood closed, brake pedal not pressed).
6
Test the remote start feature with a second key fob to rule out a malfunctioning fob.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked in a safe, open area.
Disconnect the negative terminal of the battery for safety.

2. Inspect Key Fob

Remove the back cover of the key fob using a flat-head screwdriver.
Replace the battery with a new CR2032 or equivalent battery.
Reassemble the key fob and test the remote start feature.

3. Check Remote Start Settings

Turn on the ignition (do not start the engine).
Navigate to the "Settings" menu on the infotainment screen.
Select "Remote Start" and ensure the feature is enabled.
Adjust any relevant settings (e.g., "Remote Start Auto Heat" or "Remote Start Duration").
Turn off the ignition.

4. Inspect Vehicle Conditions

Ensure all doors, the hood, and the tailgate are securely closed.
Check that the engine is in a state that allows for remote starting (e.g., no warning lights indicating issues).
Confirm that the brake pedal is not pressed, as this will prevent remote starting.

5. Reconnect Battery and Test

Reconnect the negative terminal of the battery.
Test the remote start feature by pressing the button on the key fob.
Observe for any audible confirmation or dashboard indicators.