how to troubleshoot my BMW 3 Series G20/G21 (2019-2024) remote start issues

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

507 words

Problem Statement

The remote start feature on a BMW 3 Series G20/G21 (2019-2024) is not functioning as intended, preventing the vehicle from starting remotely.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent short circuits.

Symptoms

•Remote start button unresponsive
•"Remote Start Inactive" message displayed on the dashboard
•Vehicle does not start when remote start is attempted
•Key fob battery appears to be functioning (lights up when buttons pressed)
•Engine starts but shuts off immediately

Diagnostic Steps

1
Check the key fob battery level and replace if necessary.
2
Verify that the vehicle is in a suitable environment for remote start (e.g., doors closed, hood closed).
3
Use the BMW Connected app to check remote start settings and status.
4
Scan the vehicle’s onboard diagnostics (OBD-II) for any fault codes related to the remote start system.
5
Inspect the vehicle's alarm and immobilizer systems for potential malfunctions.
6
Test the functionality of the remote start feature using an alternate key fob if available.

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

•Instructions:**
•Use the screwdriver to gently pry open the key fob casing.
•Remove the old battery and replace it with a new CR2032 battery, ensuring correct polarity.
•Snap the key fob casing back together securely.

Parts Required

•CR2032 battery (for key fob)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the key fob battery level and replace if necessary.
2
Verify that the vehicle is in a suitable environment for remote start (e.g., doors closed, hood closed).
3
Use the BMW Connected app to check remote start settings and status.
4
Scan the vehicle’s onboard diagnostics (OBD-II) for any fault codes related to the remote start system.
5
Inspect the vehicle's alarm and immobilizer systems for potential malfunctions.
6
Test the functionality of the remote start feature using an alternate key fob if available.

Solution

1. Preparation

Gather necessary tools and replacement parts.
Ensure the vehicle is parked in a safe and accessible location.
Disconnect the vehicle battery to prevent any electrical issues during repair.

2. Key Fob Battery Replacement

Tools Required: Small flat-head screwdriver, new CR2032 battery.
Instructions:
1. Use the screwdriver to gently pry open the key fob casing.
2. Remove the old battery and replace it with a new CR2032 battery, ensuring correct polarity.
3. Snap the key fob casing back together securely.

3. Check Remote Start Settings

Instructions:
1. Reconnect the battery and turn on the vehicle's ignition.
2. Access the vehicle’s settings via the infotainment system.
3. Navigate to the "Vehicle Settings" menu and select "Remote Start."
4. Ensure that remote start is enabled and configured correctly.

4. Inspect Alarm and Immobilizer Systems

Instructions:
1. Check for any visible damage or loose connections in the alarm system wiring.
2. Use a multimeter to test the continuity of the alarm system components.
3. If any components are faulty, replace them according to the manufacturer’s specifications.

5. Reprogram Key Fob (if necessary)

Tools Required: Diagnostic scanner (compatible with BMW).
Instructions:
1. Connect the diagnostic scanner to the OBD-II port.
2. Follow the scanner's prompts to reprogram the key fob.
3. Test the remote start feature after reprogramming.