What is the fault when the ST light is on in Foton trucks?
2 Answers
Foton trucks' ST light being on indicates a brake light fault, possibly meaning the brake light is not working. The ST is a brake light filament alarm light, also known as the brake light filament break indicator. The dashboard displays an image composed of an S and a T. When this light comes on, it is necessary to promptly check whether the brake light filament is broken and address the issue in time. If the brake light filament is not broken, it might be a relay failure, and it is recommended to contact a service station for inspection. Foton trucks are a Chinese automobile brand, mainly producing commercial vehicles. Foton Motor has always kept up with the technological trends of new energy vehicles, continuously developing energy-saving and environmentally friendly products and entering commercial operation. Energy-saving and new energy vehicles have covered various fields such as trucks, buses, and multi-purpose vehicles.
In my years of driving Foton trucks, the ST light coming on is no small matter—it usually indicates a transmission issue. The most common causes are insufficient or leaking transmission fluid, which can accelerate gear wear. I once experienced this due to a loose oil pipe. Another possibility is sensor failure, such as a faulty speed sensor causing the system to mistakenly report an error code. At worst, it could be a burnt control module or poor wiring contact, often caused by prolonged vibration loosening connectors. If the light comes on, don't keep driving—stop, turn off the engine, check the dashboard error code, note it down, and have a technician run a computer diagnosis at the repair shop. Ignoring it can lead to expensive transmission overhauls and work delays. Regular fluid top-ups and maintenance can prevent such headaches.