how to fix BMW 5 Series F10/F11 (2010-2017) that won't start in cold weather

BMW 5 Series F10/F11 (2010-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

597 words

Problem Statement

The BMW 5 Series F10/F11 (2010-2017) is experiencing starting issues in cold weather, indicating potential problems with the battery, fuel system, or engine components.

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting the coolant system.

Symptoms

•Engine cranks slowly or not at all
•Check engine light illuminated
•Fuel gauge indicating low fuel level despite having fuel
•Unusual clicking noise from the starter
•Difficulty in turning over the engine
•Engine misfires or runs rough after starting

Diagnostic Steps

1
Check the battery voltage using a multimeter; it should read above 12.4 volts.
2
Inspect battery terminals for corrosion or loose connections.
3
Test the starter motor by bypassing the ignition switch.
4
Verify fuel pump operation by listening for it priming when the ignition is turned on.
5
Scan for any error codes using an OBD-II scanner.
6
Check the engine coolant temperature sensor readings.

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

•Multimeter
•Socket set
•Wire brush
•OBD-II scanner
•Fuel pump relay tester (optional)

Parts Required

•New battery (if necessary)
•Starter motor (if necessary)
•Fuel pump (if necessary)
•Engine coolant temperature sensor (if necessary)

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Diagnostic Steps

1
Check the battery voltage using a multimeter; it should read above 12.4 volts.
2
Inspect battery terminals for corrosion or loose connections.
3
Test the starter motor by bypassing the ignition switch.
4
Verify fuel pump operation by listening for it priming when the ignition is turned on.
5
Scan for any error codes using an OBD-II scanner.
6
Check the engine coolant temperature sensor readings.

Solution

1. Preparation

Gather tools and parts as listed below.
Ensure the vehicle is parked on a flat surface, and the parking brake is engaged.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Battery Inspection and Replacement

Inspect Battery:
- Remove the battery cover if applicable.
- Clean any corrosion on battery terminals using a wire brush.
- Tighten any loose connections.
Replace Battery (if necessary):
- Use a socket set to remove the battery hold-down clamp.
- Disconnect the positive terminal first, then the negative terminal.
- Replace with a new battery (ensure it is rated for cold weather conditions).
- Reconnect terminals: positive first, then negative.
- Secure the battery with the hold-down clamp.

3. Starter Motor Check

Test Starter Motor:
- Locate the starter motor under the vehicle.
- Use a multimeter to check for voltage at the starter solenoid while attempting to start the engine.
- If voltage is present and the starter does not engage, replace the starter motor.

4. Fuel System Inspection

Check Fuel Pump:
- Access the fuel pump relay in the fuse box and test for continuity.
- If the relay is functional, manually check the fuel pump by applying direct power to it.
- Replace the fuel pump if it fails to operate.

5. Coolant Temperature Sensor Replacement

Replace Sensor (if faulty):
- Locate the engine coolant temperature sensor, usually near the thermostat housing.
- Disconnect the electrical connector and unscrew the sensor.
- Install the new sensor and reconnect the electrical connector.