Scanline › Fault codes › Cooling
P0599Thermostat heater control circuit high
P0599 means “Thermostat heater control circuit high”. It's a generic powertrain code (vehicle speed, idle control and auxiliary inputs), so it means the same on every make, including VW, Škoda, Audi, SEAT and Cupra.
- Not urgent
- SystemCooling
- TypeGeneric (same on all makes)
- VCDS number16983
How urgent is it?
Usually not urgent; often emissions-related.
Which system and module
Scanline files it under Cooling. The first letter, P, means powertrain (engine, transmission, emissions).
Usually stored by the engine control unit (VCDS address 01, Engine).
What usually causes it
- Thermostat heater
- wiring
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.