Code GTW_w360 was reported by the “Gateway” controller in the car. The letter “w” in the middle places it among entries of the warning type.
The Gateway — the hub through which the car's controllers talk to each other, and the route software updates take. Codes from here often mean some controller has gone quiet on the bus; the real fault is usually in that controller, not the gateway.
The car is flagging that something is not right. Driving is usually still possible, but some function may be limited.
This is how the fault is named inside the car's firmware. For codes without a description it is the most precise clue there is — the name itself says what the event is about.
The text below comes from Tesla's technical documentation. We leave it in the original English so that translation cannot shift its meaning.
The Electronic Stability Program (ESP) pump increases hydraulic pressure if the pad friction is compromised (brake fade, ice buildup, etc.) The Hydraulic Fade Compensation (HFC) is designed to help generate brake force in conditions where the brake effectiveness may be reduced due to abnormal environmental circumstances. Traditionally, this function was used for the case of overheating during steep mountain descents. However, Tesla has refined the concept for use in cold and wet conditions.
Under extreme weather conditions where the brake rotors and pads may be subject to excess water, a water film on the brake surfaces could momentarily decrease the performance of the brakes. Road salts that are used in some winter climates to prevent ice formation can have a mild lubricant effect that may further degrade brake performance. In such conditions, the HFC monitors the brake system pressure and ABS-activity to identify instances of low brake performance. Additionally, brake force can be generated by running the hydraulic pump used for stability control functions.
If the HFC is triggered during heavy braking, the driver may feel a slight drop in brake pedal position, ABS-like pulsation through the brake pedal, and a surge in vehicle braking. This is normal and indicates the HFC-function is activated. The Amber ABS-active light will also flash during HFC operation.
? Customer Facing Impact:If the brake effectiveness is reduced and the brake pedal is pushed hard enough to trigger HFC, the customer will feel lower braking performance until the HFC system is activated at which point they will feel a significant increase in braking power and reduction in vehicle speed.Customers will also feel the brake pedal pulled away from their foot??.
This alert can be expected under certain environmental conditions as described in owners manual under the topic "Hydraulic Fade Compensation." If these environmental conditions are not met or brake performance does not regain to normal operation, pursue possible causes to investigate further.
Copy it exactly, letter and number included. Photographing the screen is safest — codes often differ by a single digit, and mixing them up leads somewhere else entirely.
Some codes clear after a screen restart or after the car sits locked for a few hours. If the code does not come back, it was usually a one-off glitch.
A one-off entry and a code that appears after every drive are two different things. It helps a service centre enormously if you know exactly when it shows up.
With airbags, brakes, steering and high voltage there is no point waiting it out. With the other groups you can watch and see whether the code returns at all.
Error codes are only part of the picture. For cars on TesList you also see battery health pulled straight from the vehicle, plus a price calculator that works out from current listings what a given car is actually worth today.