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VAG 16989Internal control module read only memory (ROM) error
16989 is the VW Group 5-digit number VCDS (and older VAG-COM versions) shows for P0605. P0605 means “Internal control module read only memory (ROM) error”. It's a generic powertrain code (control module and outputs), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.
- Urgent
- SystemElectronics
- TypeGeneric (same on all makes)
- VCDS number16989
How urgent is it?
Can affect safety or cause damage if ignored: get it checked soon.
Which system and module
Scanline files it under Electronics. The first letter, P, means powertrain (engine, transmission, emissions).
Usually stored by the engine control unit (VCDS address 01, Engine).
What usually causes it
- Engine module hardware or software
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.