BMW 3 Series G20/G21 (2019-2024) having issues with remote start not working

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

590 words

Problem Statement

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

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on any electrical systems.
•Ensure the vehicle is in park and on a flat surface when attempting remote start diagnostics.

Symptoms

•Remote start button does not activate the engine
•No response or notification from the vehicle's key fob
•Check control message indicating remote start failure on the dashboard
•Engine does not crank when attempting remote start
•Battery in the key fob may be low (if applicable)

Diagnostic Steps

1
Check the key fob battery and replace it if necessary.
2
Verify if the remote start feature is enabled in the vehicle settings.
3
Scan the vehicle using an OBD-II scanner for any fault codes related to the remote start system.
4
Inspect the vehicle's battery voltage to ensure it is within operational range.
5
Check the status of the vehicle's door, hood, and trunk sensors to ensure they are closed and functioning properly.
6
Confirm that the vehicle is in a location where remote start is permitted (e.g., not in a garage).

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

•Open the key fob using the screwdriver to access the battery compartment.
•Remove the old battery and replace it with the new one, ensuring correct polarity.
•Reassemble the key fob and test the remote start function.

Parts Required

•Key fob battery (CR2032)
•Replacement sensors (if necessary)

Related Faults

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Diagnostic Steps

1
Check the key fob battery and replace it if necessary.
2
Verify if the remote start feature is enabled in the vehicle settings.
3
Scan the vehicle using an OBD-II scanner for any fault codes related to the remote start system.
4
Inspect the vehicle's battery voltage to ensure it is within operational range.
5
Check the status of the vehicle's door, hood, and trunk sensors to ensure they are closed and functioning properly.
6
Confirm that the vehicle is in a location where remote start is permitted (e.g., not in a garage).

Solution

1. Preparation

Gather tools and materials.
Ensure the vehicle is parked in a safe location.
Disconnect the battery to reset the vehicle's electronic systems if necessary.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, new battery (typically CR2032)
Open the key fob using the screwdriver to access the battery compartment.
Remove the old battery and replace it with the new one, ensuring correct polarity.
Reassemble the key fob and test the remote start function.

3. Check Vehicle Settings

Reconnect the battery if it was disconnected.
Start the vehicle using the ignition key.
Access the vehicle's iDrive system and navigate to "Settings" > "Doors/Keys" > "Remote Start."
Ensure that the remote start feature is enabled. If it was disabled, enable it and save changes.

4. Inspect Door, Hood, and Trunk Sensors

Check the functionality of the door, hood, and trunk sensors by opening and closing each and listening for the corresponding click or confirmation sound.
Clean any debris or dirt from the sensor areas.
If a sensor is malfunctioning, replace it as needed.

5. Battery Voltage Check

Tools Required: Multimeter
Connect the multimeter to the vehicle battery terminals.
Check the voltage; it should be around 12.6 volts or higher when the vehicle is off.
If the voltage is low, charge or replace the battery.

6. Clear Fault Codes

Tools Required: OBD-II scanner
Connect the OBD-II scanner to the vehicle’s diagnostic port.
Read and clear any fault codes related to the remote start system.
Test the remote start function again.