The P1385 code on Volkswagens is a manufacturer-specific code (OBD-II P1xxx) and should not be confused with generic codes. Unlike Mercedes-Benz, where P1385 relates to the camshaft, in Volkswagen, this code is often linked to the ignition system, specifically a malfunction in the primary circuit of an ignition coil. This article explains the causes, symptoms, and solutions for resolving P1385 on a Volkswagen.
Meaning of Code P1385 (Volkswagen)
Depending on the model and year, P1385 may be recorded when the ECU detects an anomaly in the primary circuit of ignition coil “F” (cylinder 6 on V engines). This issue affects ignition management, leading to misfires and a loss of performance.
Common Symptoms
- Check Engine Light: Illuminated, sometimes accompanied by an error message.
- Engine Shaking: Especially at idle or during acceleration.
- Loss of Power: Difficulty on inclines or during acceleration.
- Increased Fuel Consumption: Degradation of engine efficiency.
- Risk of Catalyst Damage: If the problem persists, misfires can damage exhaust components.
Possible Causes
- Faulty Ignition Coil: Wear or internal short circuit (often coil F).
- Wiring Problem: Damaged wires, oxidized or loose connectors.
- Blown Fuse: In the coil power circuit.
- Faulty Spark Plug: Excessive resistance or broken insulation.
- ECU Failure: Rare, but possible in case of overvoltage.
Diagnostic Steps
- Read Related Codes: Check for other codes (e.g., P0306 for a misfire in cylinder 6).
- Visual Inspection:
- Check coil F and its connector.
- Look for signs of corrosion, burning, or moisture.
- Coil Test:
- Measure primary resistance (typically between 0.5 and 2 Ω).
- Compare with a functioning coil (swap method).
- Spark Plug Check: A worn spark plug can overload the coil.
- Electrical Circuit Analysis: Use a multimeter to test continuity and supply voltage (12V with ignition on).
Recommended Solutions
- Replace Coil F: Average cost of a new coil: €50 to €150 (depending on model).
- Repair Wiring: If wires are damaged, repair with waterproof connectors.
- Change Spark Plug: Use suitable spark plugs (e.g., NGK, Bosch).
- Reset ECU: Clear codes with an OBD-II tool (e.g., VCDS for Volkswagen).
Estimated Costs
- Ignition Coil: €50 – €150 (part).
- Labor: 0.5 to 1 hour (€50 – €120).
- Spark Plug: €10 – €30 per unit.
FAQ
Q: Can I drive with a P1385 code?
A: Not recommended – Misfires risk damaging the catalyst, which is very expensive to replace.
Q: How to identify coil F?
A: On a V6 TSI, coil F corresponds to cylinder 6 (consult the manual or an engine diagram).
Q: Should all coils be replaced?
A: No, unless others show signs of weakness. Prioritize accurate diagnosis.
Conclusion
On Volkswagen, code P1385 generally points to a localized failure in the ignition system. Although some repairs are DIY-accessible, using a specialized diagnostic tool (like VCDS) is recommended to avoid errors. If in doubt, consult a certified Volkswagen mechanic to preserve your vehicle’s reliability.
For model-specific information, refer to the workshop manual or an authorized VW garage.