GMC Sierra T1XX (2019-Present) remote start not working what should I do

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

520 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 solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to avoid shocks or shorts.
•Allow the engine to cool before accessing electrical components.

Symptoms

•Remote start button on the key fob does not activate the engine
•No response or sound when pressing the remote start button
•Check engine light illuminated on the dashboard
•Vehicle starts normally with the key but not remotely
•Issues with other key fob functions (e.g., locking/unlocking)

Diagnostic Steps

1
Check the vehicle's battery voltage to ensure it is sufficiently charged.
2
Inspect the key fob battery and replace it if necessary.
3
Scan for error codes using an OBD-II scanner to identify any related issues.
4
Verify that the remote start feature is enabled in the vehicle settings.
5
Check the brake pedal switch to ensure it is functioning properly.
6
Inspect for any blown fuses related to the remote start or ignition system.

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
•Multimeter
•Fuse puller
•Socket set

Parts Required

•CR2032 key fob battery
•Brake pedal switch (if faulty)
•Replacement fuses (if applicable)

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Diagnostic Steps

1
Check the vehicle's battery voltage to ensure it is sufficiently charged.
2
Inspect the key fob battery and replace it if necessary.
3
Scan for error codes using an OBD-II scanner to identify any related issues.
4
Verify that the remote start feature is enabled in the vehicle settings.
5
Check the brake pedal switch to ensure it is functioning properly.
6
Inspect for any blown fuses related to the remote start or ignition system.

Solution

1. Preparation

Gather the necessary tools and parts.
Ensure the vehicle is parked in a safe location with the engine off.
Disconnect the battery to prevent any electrical issues while working.

2. Replace Key Fob Battery

Sub-steps:
1. Open the key fob using a flathead screwdriver.
2. Remove the old battery and replace it with a new CR2032 battery, ensuring correct orientation.
3. Snap the key fob back together.

3. Inspect and Test the Brake Pedal Switch

Sub-steps:
1. Locate the brake pedal switch, typically found above the brake pedal.
2. Disconnect the wiring harness from the switch.
3. Use a multimeter to check for continuity when the brake pedal is pressed.
4. If the switch is faulty, replace it with a new one.

4. Check Remote Start Settings

Sub-steps:
1. Turn on the ignition without starting the engine.
2. Navigate to the vehicle settings on the infotainment system.
3. Ensure the remote start feature is enabled.
4. Save settings and exit.

5. Inspect Fuses

Sub-steps:
1. Locate the fuse box, typically under the dashboard or in the engine compartment.
2. Identify the fuses related to the remote start system (refer to the owner's manual for specific fuse locations).
3. Check for any blown fuses and replace them with fuses of the same amperage.

Tools Required:

OBD-II scanner
Flathead screwdriver
Multimeter
Fuse puller
Socket set

Parts Required:

CR2032 key fob battery
Brake pedal switch (if faulty)
Replacement fuses (if applicable)

Estimated Repair Time: 1-2 hours

Safety Warnings:

Disconnect battery before working on electrical systems to avoid shocks or shorts.
Allow the engine to cool before accessing electrical components.