how to fix my GMC Sierra T1XX (2019-Present) if the remote start isn't working

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

513 words

Problem Statement

Learn how to diagnose and fix remote start issues in 2019-Present GMC Sierra T1XX. 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 the battery before working on electrical systems to prevent short circuits.

Symptoms

•Remote start button does not respond when pressed
•Check engine light illuminated
•Vehicle does not start or crank when using remote start
•Key fob battery low warning displayed
•Engine starts but immediately shuts off
•Remote start feature disabled message displayed on dashboard

Diagnostic Steps

1
Check the key fob battery and replace it if necessary.
2
Verify that all doors are closed and the hood is securely latched.
3
Scan the vehicle's OBD-II for any related error codes.
4
Inspect the remote start module and wiring for any visible damage.
5
Ensure the vehicle is not in 'Park' or 'Neutral' mode, as this can affect remote start functionality.
6
Check for any active security system alerts or malfunctions.

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
•Basic hand tools (screwdrivers, socket set)

Parts Required

•Key fob battery (CR2032)
•Remote start module (if damaged)

Related Faults

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Diagnostic Steps

1
Check the key fob battery and replace it if necessary.
2
Verify that all doors are closed and the hood is securely latched.
3
Scan the vehicle's OBD-II for any related error codes.
4
Inspect the remote start module and wiring for any visible damage.
5
Ensure the vehicle is not in 'Park' or 'Neutral' mode, as this can affect remote start functionality.
6
Check for any active security system alerts or malfunctions.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, basic hand tools (screwdrivers, socket set).
Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Replace Key Fob Battery

Open the key fob using a small screwdriver.
Remove the old battery and replace it with a new battery (typically CR2032).
Reassemble the key fob and test the remote start function.

3. Inspect Remote Start Module

Locate the remote start module (usually found under the dash or near the fuse box).
Visually inspect the module for any signs of damage or corrosion.
Using a multimeter, check the wiring connections to ensure they are secure and functioning.
If damaged, replace the remote start module with an OEM part.

4. Reset Security System

After ensuring all connections are secure, reconnect the battery.
Use the OBD-II scanner to clear any error codes related to the remote start or security system.
Lock and unlock the doors using the key fob to reset the security system.

5. Test Remote Start

Ensure the vehicle is in a safe area and that all doors are closed.
Press the remote start button on the key fob to test functionality.
Verify that the engine starts and runs for the expected duration.