why is my BMW 3 Series G20/G21 (2019-2024) remote start not working

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

503 words

Problem Statement

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

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Remote start button is unresponsive.
•Engine does not crank when attempting to start remotely.
•Check engine light illuminated on the dashboard.
•Vehicle does not lock/unlock with the remote.
•Climate control settings do not activate with remote start.

Diagnostic Steps

1
Verify key fob battery is charged and functioning properly.
2
Check for any error codes using an OBD-II scanner.
3
Inspect the remote start feature settings in the vehicle's infotainment system.
4
Ensure all doors, hood, and trunk are securely closed.
5
Test the key fob's range and functionality with direct locking/unlocking.
6
Check for any active security system alerts that may inhibit 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

•Remove the key fob cover using the screwdriver to access the battery compartment.
•Replace the old battery with a new coin cell battery (typically CR2032).
•Reassemble the key fob and test remote start functionality.

Parts Required

•Key fob battery (typically CR2032)

Related Faults

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Diagnostic Steps

1
Verify key fob battery is charged and functioning properly.
2
Check for any error codes using an OBD-II scanner.
3
Inspect the remote start feature settings in the vehicle's infotainment system.
4
Ensure all doors, hood, and trunk are securely closed.
5
Test the key fob's range and functionality with direct locking/unlocking.
6
Check for any active security system alerts that may inhibit remote start.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the vehicle battery to prevent electrical shorts during repairs.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver
Remove the key fob cover using the screwdriver to access the battery compartment.
Replace the old battery with a new coin cell battery (typically CR2032).
Reassemble the key fob and test remote start functionality.

3. Reset Remote Start Settings

Tools Required: None
Start the vehicle using the ignition key.
Navigate to the vehicle’s settings through the infotainment system.
Locate the remote start feature settings and ensure it is enabled.
Save any changes made and turn off the vehicle.

4. Inspect Security System

Tools Required: OBD-II scanner
Reconnect the battery and start the vehicle.
Use the OBD-II scanner to check for any security system fault codes.
If codes are present, follow manufacturer guidelines to clear them or address the specific issues.

5. Verify Door and Hood Sensors

Tools Required: None
Ensure that all doors, the hood, and the trunk are completely closed.
Manually check each door and hood latch for proper operation.
Replace any faulty door or hood sensors that may prevent remote start.