how to fix my 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

554 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 in your 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 shorts.
•Allow the vehicle to cool down before handling any components.

Symptoms

•Remote start button does not engage the engine
•No response from the vehicle when attempting to use the remote start
•Check engine light illuminated on the dashboard
•Vehicle does not start with the key fob after multiple attempts
•Door locks or lights do not respond when remote start is attempted

Diagnostic Steps

1
Verify that the vehicle is equipped with the remote start feature by checking the owner’s manual.
2
Check the key fob battery status and replace if necessary.
3
Ensure all doors, hood, and trunk are closed securely, as remote start will not function if any are ajar.
4
Inspect the vehicle’s battery for charge and connections to ensure it is not low or faulty.
5
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate a fault in the system.
6
Test the remote start system with a second key fob to rule out a faulty 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
•Small flat-head screwdriver
•Wire brush
•Multimeter

Parts Required

•Key fob battery (CR2032 or equivalent)

Related Faults

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Symptoms

•Remote start button does not engage the engine

•No response from the vehicle when attempting to use the remote start

•Check engine light illuminated on the dashboard

•Vehicle does not start with the key fob after multiple attempts

•Door locks or lights do not respond when remote start is attempted

Diagnostic Steps

1
Verify that the vehicle is equipped with the remote start feature by checking the owner’s manual.
2
Check the key fob battery status and replace if necessary.
3
Ensure all doors, hood, and trunk are closed securely, as remote start will not function if any are ajar.
4
Inspect the vehicle’s battery for charge and connections to ensure it is not low or faulty.
5
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate a fault in the system.
6
Test the remote start system with a second key fob to rule out a faulty fob.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked safely and on a flat surface.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Key Fob Battery Replacement

Sub-steps:
1. Open the key fob using a small flat-head screwdriver.
2. Remove the old battery (typically a CR2032 or equivalent).
3. Insert the new battery, ensuring correct polarity.
4. Reassemble the fob and test the remote start function.

3. Inspect and Repair Battery Connections

Sub-steps:
1. Reconnect the negative battery terminal.
2. Inspect battery terminals for corrosion or loose connections.
3. Clean the terminals using a wire brush if corrosion is present and tighten any loose connections.

4. Reset the Remote Start System

Sub-steps:
1. With the vehicle in the "OFF" position, press the brake pedal.
2. Turn the ignition to "ON" without starting the engine, then turn it back to "OFF".
3. Repeat this process three times rapidly to reset the remote start system.

5. Address Fault Codes

Sub-steps:
1. Review any DTCs received from the OBD-II scanner.
2. Research the codes to identify the issue (e.g., a fault in the security system or engine sensors).
3. Repair or replace faulty components as indicated by the codes.