What Causes the Power Steering Warning Light to Illuminate?
2 Answers
Power steering warning light may illuminate due to obstructed power steering fluid, solenoid valve malfunction, or poor plug connection. Below are detailed explanations: Obstructed Power Steering Fluid: Insufficient power steering fluid, blocked fluid passages, or air in the fluid lines can cause overall fluid flow obstruction and poor power steering pump performance. It is essential to select the correct type of power steering fluid and replace it regularly. Solenoid Valve Malfunction: Faulty electrical components such as the pressure relief solenoid valve or torque sensor may send incorrect signals, triggering the warning light. Poor Plug Connection: Poor contact in the control system wiring harness plugs, blown fuses, damaged relays, or failures in the controller, motor, or sensors can impair the electric power steering system.
Having driven for over a decade, the most common reasons I've encountered for the power steering warning light to come on are insufficient steering fluid or a faulty pump. Aged steering fluid tends to leak, especially under high temperatures, where worn seals lead to insufficient oil pressure and trigger the warning light. Loose hose connections or post-collision deformations can also cause leaks. If not addressed promptly, the steering wheel will become increasingly heavy, posing risks during high-speed driving. I generally recommend checking the steering fluid level monthly to ensure it stays between the minimum and maximum marks, topping it up immediately if low. For electronic power steering systems, a dirty sensor or short circuit can also illuminate the warning light, requiring professional diagnostic equipment—avoid randomly unplugging connectors yourself.
