Fault code

P0805 fault code.

This code comes up with one known fault.

Generic code

Code type

Engine and drivetrain

System

Electrical fault of the clutch position sensor

The control unit measured a fault in the electrical circuit of the sensor that reports the clutch position. On a dual clutch gearbox this makes the shifts imprecise.

The code tells you what the control unit measured, not which part has failed. The same code has several possible causes.

Which known faults it comes up with

DQ381 (7 speed wet DSG): mechatronics and clutch position sensor

expensive

The 7 speed, wet clutch DSG that replaced the DQ250 in the MQB models (0GC / DQ381) is vulnerable from the mechatronics side. Typical faults are a harsh 2 to 3 shift, delayed D/R engagement and limp mode; a fault in the clutch position sensors gives a separate group of codes.

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The wet clutch is more durable than the dry one, but as it wears you get shuddering and slipping when pulling away: the revs flare and the acceleration does not follow.

What to check

Standing still on the brake, shift between D and R and watch the engagement time and any jolt
Try pulling away on a slope too: shuddering, or revving without pulling, points to clutch wear
On the test drive watch the 2 to 3 shift specifically, cold and warm

2 more steps in the write-up

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

A fault on the list does not mean the car you are looking at has it.
A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.

Details in the terms