how do I fix my 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

501 words

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

•Always disconnect the battery before working on electrical systems to avoid shocks

Symptoms

•Remote start button does not respond when pressed
•Vehicle does not start or crank when attempting remote start
•Remote start feature works intermittently
•Check engine light illuminated
•Security light flashing on the dashboard

Diagnostic Steps

1
Verify that the vehicle is in a secure location and that all doors are closed
2
Check the battery condition of the key fob and replace it if weak or dead
3
Inspect vehicle settings through the infotainment system to ensure remote start is enabled
4
Scan the vehicle's computer for any diagnostic trouble codes (DTCs) using an OBD-II scanner
5
Inspect the remote start system's wiring and connections for any visible damage or corrosion
6
Check the fuel level, as some systems will not allow remote start if fuel is low

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
•Multimeter
•Screwdriver set
•Wiring harness repair kit

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Verify that the vehicle is in a secure location and that all doors are closed
2
Check the battery condition of the key fob and replace it if weak or dead
3
Inspect vehicle settings through the infotainment system to ensure remote start is enabled
4
Scan the vehicle's computer for any diagnostic trouble codes (DTCs) using an OBD-II scanner
5
Inspect the remote start system's wiring and connections for any visible damage or corrosion
6
Check the fuel level, as some systems will not allow remote start if fuel is low

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, screwdriver set, wiring harness repair kit.
Ensure the vehicle is parked safely and the engine is off.
Disconnect the vehicle battery to prevent any electrical shorts during repair.

2. Replace Key Fob Battery

Locate the seam on the key fob and use a small screwdriver to carefully pry it open.
Remove the old battery and replace it with a new CR2032 battery, ensuring the polarity is correct.
Snap the key fob back together and test the remote start feature.

3. Check and Enable Remote Start in Settings

Reconnect the battery and turn on the ignition without starting the engine.
Navigate to the vehicle settings in the infotainment system.
Go to "Vehicle" > "Remote Start" and confirm that the feature is enabled.

4. Inspect Wiring and Connections

Check the wiring harness connected to the remote start module for any signs of wear or damage.
Repair any damaged wires using a wiring harness repair kit.
Ensure all connectors are securely attached.

5. Clear Diagnostic Trouble Codes

Use an OBD-II scanner to check for any stored DTCs related to the remote start system.
Clear any codes found and test the remote start functionality again.