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VAG 17120Reverse incorrect ratio
17120 is the VW Group 5-digit number VCDS (and older VAG-COM versions) shows for P0736. P0736 means “Reverse 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 number17120
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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Open ScanlineScanline 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.