What does it mean when the SVS light is on in a diesel vehicle?
2 Answers
Diesel vehicle SVS light on is the engine fault light. When the SVS indicator light is on, it indicates that the engine control unit has detected an error signal from a certain sensor or that it has exceeded the usage standard. When the ignition switch is turned on, the vehicle's SVS indicator light will illuminate for an automatic check and then turn off automatically after a few seconds, which is a normal phenomenon. If it stays on, it indicates a fault in the vehicle's electronic control system. The reasons for the SVS light being on in a diesel vehicle include: 1. Poor engine combustion state; 2. Engine knocking; 3. Poor quality of vehicle fuel; 4. Dirty engine cylinder interior with deposited carbon deposits; 5. The electronic control unit cannot obtain engine data.
I've encountered the SVS light coming on several times during my over ten years of driving diesel trucks for transportation. This light is the warning indicator for the engine control system, and nine times out of ten, it's caused by a faulty sensor. In the past, I've had issues like a defective coolant temperature sensor causing erratic temperature readings on the dashboard, and another time it was the exhaust pressure sensor acting up, making the vehicle jerk while driving. The most troublesome was fuel system problems - a clogged diesel filter or dirty injectors would make the truck wheeze like it had asthma. If the DPF filter gets completely blocked, the light will come on too, and if left untreated, the engine will directly limit its power. I remember once when the light came on and I stubbornly kept driving, only to break down halfway. Now I've learned my lesson - as soon as the light comes on, I pull over, shut off the engine, and call the repair shop. They just plug in the diagnostic computer and immediately know what's wrong. Replacing a sensor costs around a hundred bucks - definitely not worth delaying until it becomes an engine overhaul situation.
