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

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

508 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 GMC Sierra T1XX (2019-Present). 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 vehicle battery if working on electrical components to avoid shorts

Symptoms

•Remote start button on the key fob does not activate the vehicle
•No response from the vehicle when attempting remote start
•Check engine light may be illuminated
•Possible security system warning or indicator light activated
•Engine may not start even when the ignition key is used

Diagnostic Steps

1
Verify the battery condition of the key fob using a multimeter
2
Check for any error codes using an OBD-II scanner
3
Inspect the vehicle's battery voltage and connections for corrosion or looseness
4
Ensure all doors are closed properly and that the vehicle is in park
5
Confirm that the remote start feature is enabled in the vehicle's settings via the infotainment system
6
Test the remote start feature with a spare key fob to rule out a malfunctioning key

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

•Multimeter
•Flathead screwdriver
•OBD-II scanner

Parts Required

•Key fob battery (CR2032)

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Diagnostic Steps

1
Verify the battery condition of the key fob using a multimeter
2
Check for any error codes using an OBD-II scanner
3
Inspect the vehicle's battery voltage and connections for corrosion or looseness
4
Ensure all doors are closed properly and that the vehicle is in park
5
Confirm that the remote start feature is enabled in the vehicle's settings via the infotainment system
6
Test the remote start feature with a spare key fob to rule out a malfunctioning key

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface with sufficient space around it.
Disable the security system if applicable.

2. Key Fob Battery Replacement

Remove the Key Fob Shell
- Use a flathead screwdriver to gently pry open the key fob.
- Take care not to damage the housing.
Replace Battery
- Remove the old battery (typically a CR2032).
- Insert a new battery ensuring the positive (+) side faces up.
Reassemble Key Fob
- Snap the key fob casing back together until secure.

3. Check Vehicle Settings

Access Infotainment System
- Start the vehicle and navigate to the settings menu.
Enable Remote Start Feature
- Locate the remote start settings and ensure it is turned on.
- Save settings and exit the menu.

4. Battery and Connection Check

Inspect Battery Voltage
- Use a multimeter to check the vehicle battery voltage (should be around 12.6V).
- If voltage is low, charge or replace the vehicle battery.
Examine Battery Connections
- Inspect the battery terminals for corrosion.
- Clean and tighten connections as necessary.

5. Test Remote Start Feature

Attempt to use the remote start feature again with the key fob.
Ensure the vehicle is in park and all doors are closed.