why does my Volkswagen Golf MK7 (2015-2019) engine cranking but not starting

Volkswagen Golf MK8.5 (2024-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

560 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 engine cranking issue in Volkswagen Golf MK7 (2015-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Fuel System

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 or removing components.

Symptoms

•Engine cranks but does not start
•Check engine light illuminated
•No sound from the fuel pump when turning the key to the ON position
•Possible fuel odor near the vehicle
•Battery voltage adequate but cranking is sluggish
•Dashboard lights dim during cranking

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes.
2
Check the battery voltage and condition; inspect battery terminals for corrosion.
3
Listen for the fuel pump operation when the ignition is turned to the ON position.
4
Verify fuel pressure at the fuel rail using a fuel pressure gauge.
5
Inspect fuses related to the fuel pump and ignition system.
6
Check for spark at the ignition coils using a spark tester.

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
•Fuel pressure gauge
•Socket set
•Ratchet and extensions
•Spark tester

Parts Required

•Fuel pump (if faulty)
•Spark plugs (if worn or fouled)
•Ignition coils (if defective)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes.
2
Check the battery voltage and condition; inspect battery terminals for corrosion.
3
Listen for the fuel pump operation when the ignition is turned to the ON position.
4
Verify fuel pressure at the fuel rail using a fuel pressure gauge.
5
Inspect fuses related to the fuel pump and ignition system.
6
Check for spark at the ignition coils using a spark tester.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
Disconnect the negative battery terminal for safety.

2. Inspect the Fuel System

Check Fuel Pump:
- Reconnect the battery terminal.
- Turn the ignition to the ON position without starting the engine.
- Listen for a humming sound from the fuel tank; if not present, the fuel pump may be faulty.
Test Fuel Pressure:
- Connect a fuel pressure gauge to the fuel rail.
- Turn the ignition to the ON position and check the pressure; it should be within the manufacturer specifications (typically around 50-60 psi).
- If pressure is low or non-existent, replace the fuel pump.

3. Inspect the Ignition System

Check Spark Plugs:
- Remove spark plugs using a socket and ratchet.
- Inspect for wear or fouling; replace if necessary.
Verify Ignition Coils:
- Test each ignition coil for proper function with a multimeter.
- Replace any coils that are out of spec.

4. Electrical System Check

Inspect Fuses:
- Locate the fuse box and check for blown fuses related to the fuel pump and ignition system.
- Replace any blown fuses with appropriate amperage.
Check Battery Condition:
- If the battery is weak, jump-start or replace it as necessary.