my BMW 5 Series F10/F11 (2010-2017) won’t start but lights work what could it be

BMW 5 Series F10/F11 (2010-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

627 words

Problem Statement

The BMW 5 Series F10/F11 (2010-2017) is experiencing a no-start condition despite the lights functioning properly, indicating that the issue is likely related to the starting or f

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 working on the ignition system or fuel components.

Symptoms

•Engine cranks but does not start
•No fuel pump noise when the ignition is turned on
•Dashboard warning lights illuminated (e.g., check engine light, battery light)
•Possible clicking noise from the starter motor
•Security system indicator flashing
•Loss of power to electrical accessories during cranking

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
2
Verify battery voltage with a multimeter; it should be above 12.4 volts.
3
Check the fuel pump fuse and relay for continuity and proper operation.
4
Inspect the ignition system components, including the ignition coil and spark plugs.
5
Test the starter motor by bypassing the ignition switch to see if it engages.
6
Verify the operation of the crankshaft position sensor.
7
Check the fuel pressure at the fuel rail using a fuel pressure gauge.

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
•Socket set
•Torque wrench
•Fuel pressure gauge
•Wire brush

Parts Required

•Fuel pump relay
•Ignition coils (if needed)
•Spark plugs (if needed)
•Starter motor (if needed)
•Crankshaft position sensor (if needed)

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Symptoms

•Engine cranks but does not start

•No fuel pump noise when the ignition is turned on

•Dashboard warning lights illuminated (e.g., check engine light, battery light)

•Possible clicking noise from the starter motor

•Security system indicator flashing

•Loss of power to electrical accessories during cranking

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
2
Verify battery voltage with a multimeter; it should be above 12.4 volts.
3
Check the fuel pump fuse and relay for continuity and proper operation.
4
Inspect the ignition system components, including the ignition coil and spark plugs.
5
Test the starter motor by bypassing the ignition switch to see if it engages.
6
Verify the operation of the crankshaft position sensor.
7
Check the fuel pressure at the fuel rail using a fuel pressure gauge.

Solution

1. Preparation

Gather tools and parts required.
Ensure vehicle is in a safe location and secured with wheel chocks.
Disconnect the battery to prevent electrical shock.

2. Check Battery and Connections

Inspect battery terminals for corrosion or loose connections.
Clean terminals with a wire brush and re-tighten.
If necessary, jump-start the vehicle or replace the battery if it's weak.

3. Inspect Fuel System

Fuel Pump Relay Replacement:
- Locate the fuel pump relay in the fuse box.
- Remove the relay and replace it with a new one.
Fuel Pump Testing:
- If the relay is fine, check the wiring harness to the fuel pump.
- If no voltage is present, trace back to the fuel pump fuse and replace if blown.

4. Examine the Ignition System

Ignition Coil and Spark Plug Check:
- Remove the ignition coils from the spark plugs.
- Inspect the coils for physical damage; replace if necessary.
- Check the spark plugs for wear and replace if they are fouled or damaged.

5. Starter Motor Inspection

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

6. Crankshaft Position Sensor Check

Inspect the crankshaft position sensor wiring and connectors for damage.
Use a multimeter to test the sensor's resistance and replace it if it’s out of spec.