my GMC Sierra T1XX (2019-Present) remote start is not working, how can I fix it?

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

548 words

Problem Statement

Learn how to diagnose and fix remote start issues in GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, 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 avoid shocks or shorts.

Symptoms

•Remote start button does not respond when pressed
•Engine does not start remotely
•No confirmation lights or sounds when attempting to use the remote start
•Possible warning lights on the dashboard
•Inconsistent operation of the remote start feature

Diagnostic Steps

1
Check the vehicle's battery voltage using a multimeter to ensure it is fully charged.
2
Verify that the key fob battery is functioning and replace it if necessary.
3
Examine the vehicle's doors, hood, and trunk to ensure they are closed properly, as the remote start will not activate if any of these are ajar.
4
Use an OBD-II scanner to check for any error codes related to the remote start system.
5
Confirm that the vehicle is in park (automatic transmission) or neutral (manual transmission) before attempting to remote start.
6
Inspect the fob for physical damage or wear that may affect its functionality.

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
•OBD-II scanner
•Small flathead screwdriver or coin
•Basic socket set

Parts Required

•Key fob battery (type CR2032 or equivalent)

Related Faults

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Diagnostic Steps

1
Check the vehicle's battery voltage using a multimeter to ensure it is fully charged.
2
Verify that the key fob battery is functioning and replace it if necessary.
3
Examine the vehicle's doors, hood, and trunk to ensure they are closed properly, as the remote start will not activate if any of these are ajar.
4
Use an OBD-II scanner to check for any error codes related to the remote start system.
5
Confirm that the vehicle is in park (automatic transmission) or neutral (manual transmission) before attempting to remote start.
6
Inspect the fob for physical damage or wear that may affect its functionality.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked safely and on a level surface.
Disconnect the battery to prevent any electrical shorts during repair.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver or a coin
Remove the back cover of the key fob using the screwdriver or coin.
Replace the old battery with a new one, ensuring the positive and negative terminals are correctly aligned.
Reassemble the key fob and test the remote start function.

3. Inspect and Repair Electrical Connections

Tools Required: Multimeter, basic socket set
Reconnect the battery and use the multimeter to check for power at the remote start module located under the dashboard.
Visually inspect wiring for any signs of damage or corrosion.
Repair any damaged wires or connectors and ensure all connections are secure.

4. Reset the Vehicle’s Remote Start System

Tools Required: OBD-II scanner
Plug in the OBD-II scanner to the vehicle’s diagnostic port.
Follow the scanner's instructions to reset the remote start system.
Turn off the ignition and remove the scanner.

5. Test Remote Start Functionality

Reconnect the battery if it was disconnected.
Attempt to use the remote start feature again, ensuring all conditions for operation are met (vehicle in park/neutral, doors closed).