how to fix 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

549 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 the battery before working on electrical systems to prevent shorts or electrical shocks.

Symptoms

•Remote start button does not respond when pressed
•Vehicle does not start after multiple attempts
•Check engine light illuminated on the dashboard
•Security light flashing or illuminated
•Remote key fob battery low warning

Diagnostic Steps

1
Check the battery condition of the remote key fob using a multimeter.
2
Inspect the vehicle for any DTCs (Diagnostic Trouble Codes) using an OBD-II scanner.
3
Verify if the vehicle is in a suitable condition for remote start (e.g., doors closed, hood closed).
4
Test the functionality of the remote start feature with another key fob if available.
5
Check for any blown fuses related to the remote start system in the fuse box.
6
Inspect the vehicle's security system to ensure it is not preventing 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
•Screwdriver set
•Fuse puller

Parts Required

•CR2032 battery
•Replacement fuses

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the battery condition of the remote key fob using a multimeter.
2
Inspect the vehicle for any DTCs (Diagnostic Trouble Codes) using an OBD-II scanner.
3
Verify if the vehicle is in a suitable condition for remote start (e.g., doors closed, hood closed).
4
Test the functionality of the remote start feature with another key fob if available.
5
Check for any blown fuses related to the remote start system in the fuse box.
6
Inspect the vehicle's security system to ensure it is not preventing remote start.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, screwdriver set, fuse puller.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the negative battery terminal to ensure safety.

2. Replace Remote Key Fob Battery

Sub-steps:
1. Open the key fob casing using a small flathead screwdriver.
2. Remove the old battery carefully.
3. Insert a new CR2032 battery, ensuring the polarity is correct.
4. Snap the key fob casing back together.

3. Inspect and Replace Fuses

Sub-steps:
1. Locate the fuse box; usually found under the dashboard or in the engine compartment.
2. Use a fuse puller to remove the fuses related to the remote start system (refer to the owner’s manual for the specific fuse locations).
3. Inspect the fuses; if any are blown, replace them with fuses of the same amperage.

4. Reprogram Key Fob (if necessary)

Sub-steps:
1. Insert the key into the ignition and turn it to the "On" position without starting the engine.
2. Press and hold the unlock button on the driver's door while pressing the lock button on the key fob within 5 seconds.
3. Release both buttons and wait for the door locks to cycle, indicating successful reprogramming.

5. Reconnect Battery and Test

Sub-steps:
1. Reconnect the negative battery terminal and ensure it is secured.
2. Start the vehicle normally to ensure all systems are functional.
3. Test the remote start feature by pressing the remote start button on the key fob.