my GMC Sierra T1XX (2019-Present) remote start isn't working, what should I do?

GMC Sierra T1XX (2019-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

536 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 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 battery before working on electrical systems to prevent short circuits.

Symptoms

•Remote start button does not activate the engine
•No sound or indication of starting when remote start is engaged
•Check engine light illuminated on the dashboard
•Vehicle does not respond to the key fob
•Interior lights flash briefly when the remote start button is pressed
•Security system light remains illuminated

Diagnostic Steps

1
Check the key fob battery and replace if necessary.
2
Ensure the vehicle is in a suitable environment for remote start (e.g., doors closed, not in gear).
3
Verify that the vehicle's hood is closed and the hood switch is functioning properly.
4
Scan the vehicle's computer for diagnostic trouble codes (DTCs) using an OBD-II scanner.
5
Inspect the vehicle's battery voltage to ensure it is sufficient for remote start operation.
6
Check for any active security system alerts or issues that may prevent remote start.

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
•Small flathead screwdriver

Parts Required

•CR2032 battery (for key fob)
•Hood switch (if defective)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Remote start button does not activate the engine

•No sound or indication of starting when remote start is engaged

•Check engine light illuminated on the dashboard

•Vehicle does not respond to the key fob

•Interior lights flash briefly when the remote start button is pressed

•Security system light remains illuminated

Diagnostic Steps

1
Check the key fob battery and replace if necessary.
2
Ensure the vehicle is in a suitable environment for remote start (e.g., doors closed, not in gear).
3
Verify that the vehicle's hood is closed and the hood switch is functioning properly.
4
Scan the vehicle's computer for diagnostic trouble codes (DTCs) using an OBD-II scanner.
5
Inspect the vehicle's battery voltage to ensure it is sufficient for remote start operation.
6
Check for any active security system alerts or issues that may prevent remote start.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked in a safe and accessible area.
Disconnect the vehicle battery before working on electrical components.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver
Open the key fob using the screwdriver to access the battery compartment.
Remove the old battery and replace it with a new CR2032 battery, ensuring the positive side is facing up.
Reassemble the key fob and test the remote start feature.

3. Inspect Hood Switch

Tools Required: Multimeter
Locate the hood switch, typically mounted on the hood latch mechanism.
Use a multimeter to test continuity when the hood is closed; there should be continuity.
If continuity is not present, replace the hood switch.

4. Check Vehicle Battery Voltage

Tools Required: Multimeter
Measure the battery voltage with the multimeter; it should read at least 12.4 volts.
If the voltage is below this threshold, charge or replace the battery as necessary.

5. Resolve Diagnostic Trouble Codes (DTCs)

Tools Required: OBD-II scanner
Connect the OBD-II scanner to the vehicle's diagnostic port.
Read and record any trouble codes present.
Address any codes related to the remote start system (e.g., security system issues) by following the manufacturer's service manual.