my Volkswagen Golf MK7.5 (2020-Present) continues to run after turning off

Volkswagen Golf MK8.5 (2024-Present)

Error Codes

2-4 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 the issue of your Volkswagen Golf MK7.5 engine running after turning off the ignition. Step-by-step guide included.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shock or damage.

Symptoms

•Engine does not shut off immediately after turning the key to the OFF position
•Excessive fuel consumption
•Battery drain when the vehicle is not in use
•Unresponsive dashboard lights or accessories
•Possible error codes related to the ignition system

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any potential faults.
2
Inspect the ignition switch for signs of wear or malfunction.
3
Check for any stuck relays in the power distribution box that may be allowing power to the fuel pump or ignition system.
4
Test the fuel pump relay and ignition relay to ensure they are functioning properly.
5
Examine the wiring harness for any shorts or corrosion that could cause unintended electrical connections.
6
Verify if the engine continues to run with the key removed from the ignition, indicating a potential electrical issue.

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
•Screwdriver set
•Multimeter
•Socket set
•Wire brush
•Torque wrench

Parts Required

•Ignition switch
•Fuel pump relay
•Electrical connectors (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any potential faults.
2
Inspect the ignition switch for signs of wear or malfunction.
3
Check for any stuck relays in the power distribution box that may be allowing power to the fuel pump or ignition system.
4
Test the fuel pump relay and ignition relay to ensure they are functioning properly.
5
Examine the wiring harness for any shorts or corrosion that could cause unintended electrical connections.
6
Verify if the engine continues to run with the key removed from the ignition, indicating a potential electrical issue.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock.
Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Replace Ignition Switch

Tools Required: Screwdriver set, multimeter
Sub-steps:
1. Remove the steering column cover by unscrewing the retaining screws.
2. Disconnect the wiring harness from the ignition switch.
3. Use a multimeter to test the ignition switch for continuity.
4. If faulty, remove the ignition switch and replace it with a new one.
5. Reconnect the wiring harness and reassemble the steering column cover.

3. Check and Replace Fuel Pump Relay

Tools Required: Socket set, multimeter
Sub-steps:
1. Locate the power distribution box under the hood and identify the fuel pump relay.
2. Remove the relay and test it with a multimeter to check for continuity.
3. If defective, replace it with a new relay.
4. Reinstall the relay and ensure it's seated properly.

4. Inspect Wiring Harness

Tools Required: Wire brush, dielectric grease
Sub-steps:
1. Visually inspect the wiring harness connected to the ignition system for any signs of wear or damage.
2. Clean any corroded connectors with a wire brush.
3. Apply dielectric grease to ensure a good electrical connection.
4. Secure any loose wiring that may cause shorts.