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

high

Severity

3 min read

540 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix the remote start issue on your 2019-Present GMC Sierra T1XX. Step-by-step guide with diagnostic procedures 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.
•Allow the vehicle to cool down before inspecting components related to the engine.

Symptoms

•Remote start button does not engage the engine
•No response from the vehicle when the remote start is attempted
•Check engine light illuminated
•Security indicator light flashing
•Vehicle does not start when attempting to use the key fob

Diagnostic Steps

1
Verify the key fob battery is functional and replace it if necessary.
2
Check the vehicle's ignition status; ensure it is in the 'Off' position.
3
Inspect the vehicle's hood, doors, and trunk; ensure they are securely closed.
4
Scan for error codes using an OBD-II scanner to identify any fault codes.
5
Check the vehicle's battery voltage to ensure it is above 12.4 volts.
6
Confirm that the remote start feature is enabled in the vehicle’s settings.

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
•Flathead screwdriver
•Digital multimeter
•Socket set

Parts Required

•CR2032 key fob battery
•Replacement wiring (if necessary)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Verify the key fob battery is functional and replace it if necessary.
2
Check the vehicle's ignition status; ensure it is in the 'Off' position.
3
Inspect the vehicle's hood, doors, and trunk; ensure they are securely closed.
4
Scan for error codes using an OBD-II scanner to identify any fault codes.
5
Check the vehicle's battery voltage to ensure it is above 12.4 volts.
6
Confirm that the remote start feature is enabled in the vehicle’s settings.

Solution

1. Preparation

Gather the necessary tools and parts.
Ensure the vehicle is parked on a level surface and is in "Park."
Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Key Fob Battery

Open the key fob using a small flathead screwdriver.
Remove the old battery and replace it with a new CR2032 battery, ensuring the correct polarity.
Reassemble the key fob and test the remote start feature.

3. Inspect and Reset Security System

Reconnect the negative battery terminal.
Locate the security module; this is often under the dashboard or near the fuse box.
If error codes indicate a security issue, use the vehicle’s manual to reset the security system by following the specific procedure for your model.
Test the remote start function again.

4. Check Remote Start Settings

Start the vehicle using the ignition key.
Access the vehicle’s settings through the infotainment system.
Navigate to the "Remote Start" settings and ensure it is enabled.
Save any changes and shut off the vehicle. Test the remote start feature again.

5. Inspect Wiring and Components

If the issue persists, visually inspect the wiring leading to the remote start module.
Check for any damaged or disconnected wires.
Repair or replace any faulty wiring as necessary.