Volkswagen Code P1357 – Cylinder 1 Ignition Circuit Short to Ground

Identified Problem

Is your Volkswagen displaying the fault code P1357? This error code indicates a malfunction in the ignition coil circuit for cylinder 1, a common issue in Golf, Passat, Tiguan, and other VW group models.

Common Symptoms

• 🚨 Engine light on (check engine)
• 🌀 Rough idle and vibrations
• ⚠ Noticeable power loss
• ⛽ Increased fuel consumption
• 🔥 Misfires in cylinder 1

Probable Causes (VW Specific)

1. Faulty ignition coil (common internal failure)
2. Connector issue (oxidized connectors)
3. Damaged wiring (cut or chafed wires)
4. Worn or defective spark plug
5. ECU failure (less common)

Diagnosis in 5 Steps

1. Visual inspection
   • Check the cylinder 1 ignition coil (located on the timing belt side)
   • Inspect the condition of the connector and wires
2. Substitution test
   • Swap the coil with another cylinder
   • If the code follows → Replace the coil
3. Electrical test
   • Measure resistance:
     • Primary: 0.5-1.0 Ω
     • Secondary: 5000-10000 Ω
4. Spark plug check
   • Check gap and wear
5. Complete ECU scan
   • Use VCDS for in-depth analysis

Recommended Solutions

• ✅ Replace the ignition coil (prefer Bosch or Beru)
• ✅ Clean or replace the connector if oxidized
• ✅ Replace spark plugs if necessary (NGK recommended)
• ✅ Check wiring along its entire length

What to Absolutely Avoid

• ❌ Using low-quality parts
• ❌ Neglecting engine cover sealing
• ❌ Forgetting to reset the ECU after repair

Consequences if Ignored

• 🔧 Accelerated catalyst deterioration
• ⛽ 20% increase in fuel consumption
• 💥 Risk of long-term engine damage

Conclusion

The P1357 code on Volkswagen is usually resolved easily by replacing the faulty ignition coil. For a lasting repair:

1. Use quality OEM parts
2. Check all circuit components
3. Perform a complete diagnosis if the problem persists

🔧 Need help? Consult a Volkswagen specialist equipped with VCDS for an accurate diagnosis.