What usually causes P0600?

Internal module communication, wiring.

P0600Serial communication link

P0600 means “Serial communication link”. 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.

Fix soon
SystemElectronics
TypeGeneric (same on all makes)
VCDS number16984

How urgent is it?

Worth fixing soon; usually drivable meanwhile, but watch for symptoms.

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

Internal module communication
wiring

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.