P1735 / P1736 Clutch Position Sensor Fault 7 Speed DSG Audi, Seat, Skoda, VW Models

Introduction

At Eco Torque, one of the most common issues we see in our workshop is the clutch position sensor failing intermittently. This often triggers gearbox failure warnings on the dashboard, leaving drivers uncertain about the condition of their transmission.

In this article, we’ll outline:

• The common faults and symptoms linked to this failure
• Essential replacement parts needed for repair
• How issues within the mechatronic circuit board affect performance
• The real-world warning signs drivers experience

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Mechatronic Circuit Board Failure & Replacement Options

The mechatronic circuit board inside the DSG gearbox often fails internally. Unfortunately, the boards themselves cannot be repaired, but the issue is well documented, and replacement parts are readily available.

However the clutch pressure sensors can be removed and replaced, which save on the costly replacement of an entire mechatronic unit.

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Fault Codes & Symptoms of DSG Mechatronic Failure

A failing mechatronic circuit board produces a distinct set of fault codes and symptoms:

Fault Codes & Dashboard Warnings

• “Gearbox Malfunction” displayed in the instrument cluster
• “Gearbox in emergency operation” displayed in the instrument cluster
• Gearbox only functions in emergency (limp home) mode, allowing driving only in:
• Gears 1–3–5–7, or
• Gears 2–4–6

Driving Symptoms

• Transmission shudders while driving
• Vehicle struggles to select gears properly

Workshop Findings

• Customer-reported symptoms can usually be reproduced during testing
• One or more diagnostic trouble codes (DTCs) may be stored in the transmission control module (TCM), J217 (address word 0002):
• DTC P173500 – Position sender for clutch 1, electrical fault (Symptom code 10666)
• DTC P173600 – Position sender for clutch 2, electrical fault (Symptom code 10668)

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Repairing the TCU (Transmission Control Unit)

⚠️ This repair must only be completed by an experienced professional.

The fault stems from one of the two pressure/position sensors hardwired into the TCU of the mechatronic unit.

• At the main dealer, the only repair option is to replace the entire mechatronic unit — which is extremely expensive.
• At Eco Torque, we can repair the TCU by replacing the position sensors individually.

Our Repair Process

1. Remove the mechatronic unit.
2. Replace the faulty clutch position sensors within the TCU.
3. Refit the mechatronic unit.
4. Replace external filters and DSG transmission oil.
5. Carry out basic settings on the transmission so it learns the new clutch pressure and position.

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Upgraded Pressure Sensors Available to Buy

We now stock new and improved clutch position sensors, the same upgraded design fitted in our workshop.

🛒 Browse upgraded sensors here↗

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Need Workshop Repairs?

If you’re experiencing any of these symptoms, contact the specialists at Eco Torque:

• 📞 01462 835335
• 📧 info@eco-torque.co.uk
• 📍 Eco Torque Ltd, Unit 1A Portland Industrial Estate, Hitchin Road, Arlesey, SG15 6SG

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Get in Touch

Have you experienced issues with your DSG gearbox? Share your feedback in the comments section below — we’d love to hear about your experience.

If there are specific vehicles, gearboxes, or issues you’d like us to cover in future articles, let us know.

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❓ Frequently Asked Questions (FAQ)

Q: What causes DSG mechatronic circuit board failure?
A: The issue is linked to the hardwired clutch position sensors within the TCU. When these sensors fail, the mechatronic unit cannot control clutch pressure correctly, triggering fault codes and limp mode.

Q: Can a mechatronic circuit board be repaired?
A: No — the board itself cannot be repaired. However, at Eco Torque we can replace the individual clutch position sensors instead of replacing the full mechatronic unit.

Q: What are the warning signs of DSG clutch position sensor failure?
A: Dashboard messages like “Gearbox Malfunction”, “Emergency Operation”, transmission shuddering, and the gearbox only selecting limited gears (1–3–5–7 or 2–4–6).

Q: How much does this repair cost compared to a dealer replacement?
A: Main dealers will only offer full mechatronic replacement, which is costly. Eco Torque offers sensor replacement and TCU repair at a more affordable rate, including fresh DSG oil and filters.