my Volkswagen Golf MK7.5 (2020-Present) won't start and only clicks, what should I do

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

3 min read

553 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

Learn how to diagnose and fix a no-start condition in Volkswagen Golf MK7.5. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is securely lifted and supported before working underneath.

Symptoms

•Engine does not crank
•Clicking sound from the starter or relay
•Dashboard lights dimming when the key is turned
•Possible illumination of the battery warning light
•No response from the starter motor

Diagnostic Steps

1
Check battery voltage using a multimeter; should be above 12.4 volts.
2
Inspect battery terminals for corrosion or loose connections.
3
Test the starter relay by swapping it with another relay of the same type in the fuse box.
4
Use an OBD-II scanner to check for any relevant trouble codes that may indicate an electrical issue.
5
Measure the voltage at the starter motor while attempting to start the engine.
6
Inspect the wiring harness and connections to the starter motor for damage or loose connections.

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
•Wire brush
•Socket set
•Torque wrench

Parts Required

•New battery (if necessary)
•Starter relay (if faulty)
•Starter motor (if required)

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Diagnostic Steps

1
Check battery voltage using a multimeter; should be above 12.4 volts.
2
Inspect battery terminals for corrosion or loose connections.
3
Test the starter relay by swapping it with another relay of the same type in the fuse box.
4
Use an OBD-II scanner to check for any relevant trouble codes that may indicate an electrical issue.
5
Measure the voltage at the starter motor while attempting to start the engine.
6
Inspect the wiring harness and connections to the starter motor for damage or loose connections.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Disconnect the battery to prevent electrical shorts.

2. Battery Inspection and Replacement

Check Battery Voltage
- Use a multimeter to measure the battery voltage. If it’s below 12.4 volts, charge or replace the battery as necessary.
- Tools Required: Multimeter.
Clean Battery Terminals
- Remove the negative (-) terminal first, followed by the positive (+) terminal.
- Clean the terminals and battery posts using a wire brush.
- Reconnect the terminals, starting with the positive (+) terminal.

3. Starter Relay Test

Locate the Starter Relay
- Refer to the owner’s manual for the exact location in the fuse box.
Swap Relay
- Remove the starter relay and replace it with an identical relay from another function that is working (e.g., horn relay).
- Attempt to start the vehicle.

4. Starter Motor Inspection

Access the Starter Motor
- Raise the vehicle safely on jack stands if necessary to access the starter.
- Disconnect the battery again for safety.
Inspect Wiring and Connections
- Check for loose or damaged wires connected to the starter motor.
- Tighten any loose connections and repair any damaged wires.
Test Starter Functionality
- If all previous steps confirm the battery and relay are functioning, test the starter motor by applying direct voltage from a jump starter or battery.
- If it does not engage, replace the starter motor.