What usually causes P0729?

Slipping clutch for that gear, low or old fluid, mechatronic unit.

P0729Gear 6 incorrect ratio

P0729 means “Gear 6 incorrect ratio”. It's a generic powertrain code (transmission), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.

Urgent
SystemTransmission
TypeGeneric (same on all makes)
VCDS number17113

How urgent is it?

Can affect safety or cause damage if ignored: get it checked soon.

Which system and module

Scanline files it under Transmission. The first letter, P, means powertrain (engine, transmission, emissions).

Usually stored by the gearbox control unit (VCDS address 02, Transmission); the engine control unit often stores a copy.

What usually causes it

Slipping clutch for that gear
low or old fluid
mechatronic unit

Typical causes are a starting point, not a diagnosis of your car.

Related codes

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Scanline explains fault codes; it isn't a repair authority. This page explains what the code means; it can't tell you what is wrong with your car. Ross-Tech's wiki has their own notes on VW Group faults.