What do fault codes P173500 and P173600 mean on a DSG gearbox?
P173500 and P173600 are DSG mechatronic fault codes that point to internal pressure regulation failures inside the gearbox control unit. In plain terms, the mechatronic unit — the combined hydraulic and electronic brain of your DSG — is struggling to maintain correct clutch-pack pressure, which causes jerky gear changes, limp-mode, or a complete refusal to select drive or reverse. The good news: in the majority of cases the gearbox itself is fine and only the mechatronic unit needs repairing, not replacing. At MnF Motors we repair DSG mechatronics from £695 fitted — dealers typically quote £2,500–£4,000. If your car is in drivable condition, we offer free collection and delivery across North London.
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Call us directly on 020 8803 1231 — we aim to respond to all enquiries within 2 hours.
What causes P173500 and P173600 to appear?
With over 25 years working on European gearboxes, our technicians at MnF Motors have traced these codes to a handful of consistent root causes:
- Worn mechatronic solenoids — the solenoid valves that control hydraulic pressure degrade over time, especially past 60,000 miles without a DSG service.
- Mechatronic circuit board failure — hairline cracks or solder joint failures on the internal PCB cause erratic pressure signals.
- Contaminated DSG fluid — old or wrong-specification fluid damages the solenoid bores and valve body surfaces.
- Sensor drift — pressure sensors inside the mechatronic unit send incorrect readings to the TCU, triggering both codes simultaneously.
A proper diagnostic — not guesswork — is the only way to confirm which of these is the culprit. Our diagnostic check starts from £60 and uses manufacturer-level tooling to read live pressure data, not just fault code numbers. Book a diagnostic before spending a penny on parts.
Can a DSG gearbox showing P173500 or P173600 actually be repaired?
Yes — in our experience the vast majority of vehicles presenting with these two codes do not need a new or remanufactured gearbox. The mechatronic unit is a serviceable, repairable component. At MnF Motors we rebuild the mechatronic to OEM specification: solenoids are tested and replaced where necessary, the PCB is inspected under magnification, the valve body is cleaned and pressure-tested, and fresh DSG fluid is filled to the correct capacity.
Our DSG mechatronic repair is £695 fitted, includes a warranty, and is carried out by technicians with 25+ years of gearbox experience — not a parts-swapping exercise. A franchised dealer will often quote a full gearbox replacement at £2,500–£4,000 without offering a repair option first. We always try the repair path before recommending replacement.
If your car is in drivable condition, take advantage of our free collection and delivery service — we come to you in N18 and across North London, carry out the work, and return the car to your door. Contact MnF Motors today to arrange collection.
How does MnF Motors compare with national chains for DSG repairs?
Chains such as Halfords Autocentres, Kwik Fit, Mr Clutch and F1 Autocentres focus mainly on routine maintenance and are not typically set up for specialist DSG mechatronic diagnostics or repairs. That means a DSG fault is more likely to be referred elsewhere or approached by swapping components until the problem goes away — which adds cost and time.
MnF Motors is an independent garage with a genuine specialism in automatic and dual-clutch gearboxes. Here is what we can say with confidence:
- Upfront, transparent pricing — £695 fitted for DSG mechatronic repair, no hidden extras
- Independent diagnosis using live data, not assumptions
- Free collection and delivery if your vehicle is in drivable condition
- Warranty on all repairs
- 25+ years of experience and a 4.9★ Google rating
We never call ourselves the cheapest — we call ourselves thorough. Call 020 8803 1231 or use the button below to get a written quote.
Frequently asked questions
Is it safe to drive with fault codes P173500 and P173600 active?
Driving is not recommended. These codes often trigger limp mode, reducing control and increasing the risk of further mechatronic damage. Have the car diagnosed promptly. If it is drivable, MnF Motors offers free collection so you don’t need to risk the journey.
How long does a DSG mechatronic repair take at MnF Motors?
Most DSG mechatronic repairs are completed within one working day once the vehicle is with us. We’ll confirm the exact timeframe after the initial diagnostic check and keep you updated throughout the process.
Do P173500 and P173600 always mean I need a new gearbox?
Not at all. In the majority of cases we see at MnF Motors, the gearbox internals are undamaged. Only the mechatronic unit requires repair or overhaul, which is far less expensive than a full gearbox replacement at dealer prices of £2,500–£4,000.
Does MnF Motors offer free collection for DSG repairs?
Yes — if your car is in drivable condition we offer free collection and delivery across North London. If the vehicle cannot be driven safely, contact us on 020 8803 1231 and we can advise on recovery options separately.
Ready to fix your DSG? Get a free quote from MnF Motors today
With 25+ years of experience, a 4.9★ Google rating, and DSG mechatronic repairs from £695 fitted, MnF Motors is North London’s trusted independent specialist for P173500 and P173600 faults. If your car is in drivable condition, we’ll collect it from you for free and return it once the work is done. Call 020 8803 1231 or use the buttons below — we aim to respond within 2 hours.