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

high

Severity

3 min read

548 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 or shocks.

Symptoms

•Remote start button does not activate the engine
•No response from the vehicle when pressing the remote start button
•Check engine light may be illuminated
•Vehicle may not start even with the key fob
•Security light flashing on the dashboard

Diagnostic Steps

1
Check the battery in the key fob to ensure it has sufficient charge.
2
Verify that the vehicle is in an appropriate state for remote starting (e.g., doors closed, hood closed).
3
Scan the vehicle's computer using an OBD-II scanner for any diagnostic trouble codes (DTCs).
4
Inspect the fuses related to the remote start system, typically found in the fuse box.
5
Test the remote start feature using a different key fob (if available) to rule out a faulty fob.
6
Check for any software updates for the vehicle's Body Control Module (BCM) that may affect the remote start functionality.

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
•Fuse puller
•Screwdriver set

Parts Required

•Key fob battery (CR2032 or equivalent)
•Replacement fuse (if necessary)

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Diagnostic Steps

1
Check the battery in the key fob to ensure it has sufficient charge.
2
Verify that the vehicle is in an appropriate state for remote starting (e.g., doors closed, hood closed).
3
Scan the vehicle's computer using an OBD-II scanner for any diagnostic trouble codes (DTCs).
4
Inspect the fuses related to the remote start system, typically found in the fuse box.
5
Test the remote start feature using a different key fob (if available) to rule out a faulty fob.
6
Check for any software updates for the vehicle's Body Control Module (BCM) that may affect the remote start functionality.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, fuse puller, screwdriver set
Ensure the vehicle is parked in a safe area and the engine is off.
Disconnect the vehicle battery (negative terminal) for safety before proceeding with any electrical work.

2. Inspect Key Fob

Open the key fob using a small screwdriver.
Replace the battery if it appears weak or dead (CR2032 or similar battery).
Reassemble the key fob and test the remote start functionality.

3. Check Fuses

Locate the fuse box (typically under the dashboard or in the engine compartment).
Use a fuse puller to remove the remote start fuse (check the owner’s manual for the specific fuse location).
Inspect the fuse for continuity using a multimeter; replace if blown.
Reinstall the fuse and check if the remote start works.

4. Clear Diagnostic Trouble Codes (DTCs)

Reconnect the vehicle battery.
Use the OBD-II scanner to read any stored DTCs.
If relevant codes are present (e.g., related to the remote start system), research and address the underlying issue before clearing the codes.
Clear the codes from the system and test the remote start again.

5. Update Body Control Module (BCM)

If software updates are needed, visit a GMC dealership or qualified repair shop.
Request a BCM update to ensure the latest software is installed.
Test the remote start feature after the update.