why does my Volkswagen Golf MK7 (2015-2019) make a strange noise when starting?

Volkswagen Golf MK7 (2015-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

529 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Diagnose and fix strange noise during startup in Volkswagen Golf MK7 (2015-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the engine is cool before inspecting or replacing components.

Symptoms

•Unusual grinding or clicking noise when turning the ignition
•Engine cranking slowly or not at all
•Battery warning light illuminated
•Starter motor not engaging properly
•Intermittent noise that may persist during engine operation
•No signs of ignition or rough startup following the noise

Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner to check for error codes.
2
Inspect the battery voltage and connections for corrosion or looseness.
3
Check the starter motor for signs of wear or damage.
4
Test the ignition switch for proper functionality.
5
Inspect the alternator for adequate charging output.
6
Listen for abnormal sounds when the ignition is engaged to isolate the noise source.

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
•Wire brush

Parts Required

•Starter motor (if faulty)
•Ignition switch (if faulty)
•Battery terminals (if corroded)

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Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner to check for error codes.
2
Inspect the battery voltage and connections for corrosion or looseness.
3
Check the starter motor for signs of wear or damage.
4
Test the ignition switch for proper functionality.
5
Inspect the alternator for adequate charging output.
6
Listen for abnormal sounds when the ignition is engaged to isolate the noise source.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is off.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Clean Battery Connections

Remove the battery terminals using a socket set.
Clean the battery posts and terminals with a wire brush to remove corrosion.
Reconnect the terminals and ensure they are tight.

3. Check the Starter Motor

Locate the starter motor beneath the vehicle (typically near the transmission).
Remove the electrical connector from the starter.
Use a multimeter to test for voltage at the starter terminal while someone else turns the ignition key.
If no voltage is present, test the ignition switch; if voltage is present but the starter does not engage, replace the starter motor.

4. Test the Ignition Switch

Remove the steering column cover to access the ignition switch.
Disconnect the ignition switch connector.
Test the switch with a multimeter for continuity when the key is turned to the start position.
Replace the ignition switch if it shows no continuity.

5. Check the Alternator

Start the vehicle and measure the voltage at the battery with a multimeter.
A healthy alternator should produce between 13.8 to 14.4 volts.
If the voltage is below this range, the alternator may need repair or replacement.