Introduction
The DQ500 DSG gearbox (internal codes 0BH / 0BT) is a 7-speed wet-clutch transmission designed for higher torque applications. It is commonly fitted to Volkswagen Transporter T5/T6/T6.1, as well as performance models such as the Audi TT RS and selected Audi Q3 and Q5 models.
While regarded as one of the stronger DSG units, the mechatronic unit in the DQ500 is a frequent source of complaints across owner forums and workshop reports. Drivers often describe sudden limp mode, loss of odd or even gears, and fault codes pointing to clutch position sensor failures.
At Eco Torque, we have dealt with numerous DQ500 failures in our workshop. Many of these relate directly to the mechatronic unit, though issues with the clutch pressure system also appear — as discussed in our previous blogs on DQ381/DQ500 clutch pressure faults.
Quick Symptoms of DQ500 Mechatronic Failure
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Vehicle enters limp mode with only a limited set of gears available
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Loss of odd or even gears (e.g., only 1-3-5-7 or 2-4-6 available)
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Dashboard warnings such as “Gearbox malfunction”
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Jerky or failed engagement when selecting drive or reverse
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Fault codes logged for clutch position sensors
Q: What are the first signs of DQ500 mechatronic failure?
A: The most common complaints are limp mode, refusal to engage odd or even gears, and persistent fault codes pointing to clutch position sensors.
Why the DQ500 Mechatronic Fails
Despite being designed as a heavy-duty DSG, the mechatronic unit remains a weak link in the DQ500. Common causes of failure include:
- Position sensor faults (clutch 1 and clutch 2)
- Electrical failures within the circuit board
- Heat and contamination affecting solenoids and sensors
Confirmed Fault Codes for the DQ500 Mechatronic
- P060700 (P0607) – Control module malfunction (DFCC 10925, 10926, 10931, 31974, 31975)
- High maximum temperature recorded for Clutch K1 – fluid discolouration, burnt smell
- P173500 (P1735) – Position sender for clutch 1, electric fault (DFCC 10666)
- P173600 (P1736) – Position sender for clutch 2, electric fault (DFCC 10668)
- P179C00 (P179C) – Main pressure valve, electric fault (DFCC 10907)
- P271600 (P2716) – Pressure control valve 4, electric fault (DFCC 10908)
- P175D00 (P175D) – Clutch 1 opens unintentionally (DFCC 10693)
- P176E00 (P176E) – Clutch 2 opens unintentionally (DFCC 10694)
- P175E00 (P175E) – Clutch 1 closes unintentionally (DFCC 10747)
- P176F00 (P176F) – Clutch 2 closes unintentionally (DFCC 10748)
- P060700 (P0607) – Control module implausible (DFCC 10658, 10660, 10662, 10664)
- P176A00 / P176B00 / P176C00 / P176D00 – Gear selector 1–4 cannot be regulated (DFCC 10912–10915, 10725–10728)
- P071500 (P0715) – Transmission input speed sensor 1, electrical fault (DFCC 10753)
- P276500 (P2765) – Transmission input speed sensor 2, electrical fault (DFCC 10754)
- P174A00 (P174A) – Valve 3 electrical malfunction in partial transmission 1 (DFCC 10739)
- P174E00 (P174E) – Valve 3 electrical malfunction in partial transmission 2 (DFCC 10740)
- P173E00 (P173E) – Valve 1 electrical malfunction in partial transmission 1 (DFCC 10741)
- P174C00 (P174C) – Valve 1 electrical malfunction in partial transmission 2 (DFCC 10742)
- P173F00 (P173F) – Valve 2 electrical malfunction in partial transmission 1 (DFCC 10743)
- P174D00 (P174D) – Valve 2 electrical malfunction in partial transmission 2 (DFCC 10744)
Workshop findings:
- Vehicle may continue to drive in limp mode
- Loss of odd or even gears depending on which sensor fails
Eco Torque’s Repair Approach
At Eco Torque, we offer both repair and replacement solutions for the DQ500 mechatronic unit.
Our process includes:
- Full diagnostic scanning to confirm codes (P173500 / P173600)
- Inspection of mechatronic components for other electrical and hydraulic issues
- Replacement of failed position sensors or complete mechatronic replacement if required
- Replacement of external filters and fresh transmission oil as part of the service
- Performing basic settings and adaptations to recalibrate the new or repaired mechatronic unit
By addressing both the electronic and hydraulic aspects of the mechatronic, we ensure long-term reliability.
❓ Frequently Asked Questions (FAQ)
Q: What vehicles are fitted with the DQ500 gearbox?
A: The DQ500 (0BH / 0BT) is fitted to VW Transporter T5/T6/T6.1, VW Tiguan, Audi Q3, Q5, and performance models such as the Audi TT RS.
Q: What are the common DQ500 mechatronic fault codes?
A: The most common are P173500 (clutch 1 position sensor) and P173600 (clutch 2 position sensor).
Q: Can the DQ500 mechatronic be repaired, or does it always need replacement?
A: In many cases, Eco Torque can repair position sensor faults, but severe failures may require full mechatronic replacement.
Q: Does Eco Torque also handle clutch pressure-related issues?
A: Yes. We have previously covered DQ381/DQ500 clutch pressure faults and regularly carry out both clutch and mechatronic repairs in-house.
💬 Get in Touch & Share Your Experience
Have you experienced DQ500 mechatronic problems? Leave a comment below with your vehicle details and fault codes — your feedback helps other owners spot issues early.
For bookings or technical advice, contact us today:
Eco Torque Ltd
Unit 1A Portland Industrial Estate
Hitchin Road
Arlesey
United Kingdom
SG15 6SG
📞 01462 835335
📧 info@eco-torque.co.uk
1 comment
Morning. Most likely not the right place, but this refers to my Tiguan CCZ DQ500, i have exchanged various DQ500,’s and also TCM, but keeps giving P174D00. Any suggestions as to what it might be? Am looking for.pointers as facilities are limited here in Kenya and right now looking at replacing the whole gearbox. For something that most likely has a simple cause
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Eco Torque replied:
Hi
Thank you for your comment, i have emailed you privately with some questions regarding your car to help better diagnose the problem.
Kind Regards
Steven Lamont Workshop Manager