What Causes All Dashboard Warning Lights to Illuminate?
2 Answers
Reasons for all dashboard warning lights illuminating: 1. CAN bus failure in the ECU, poor contact in the ECU's CAN interface; 2. Excessive dirt and carbon deposits causing abnormal air flow, preventing accurate control of normal air intake volume, resulting in unstable gas content and poor engine performance; 3. Low fuel pressure combined with poor constant pressure performance leads to inadequate system atomization level, making the vehicle difficult to start. The car dashboard is a device that reflects the working conditions of various vehicle systems, and dashboards vary among different vehicles. Indicators or warning lights on the dashboard include coolant level warning light, fuel level indicator, washer fluid level indicator, charging indicator, high/low beam indicator, transmission gear indicator, ABS (Anti-lock Braking System) indicator, traction control indicator, airbag warning light, etc.
I've been repairing cars for over ten years, and the issue of all dashboard warning lights coming on is quite common. It's mostly caused by a malfunction in the Electronic Control Unit (ECU) or slightly low battery voltage. When the ECU acts up, all sensors send chaotic signals, which is why all the lights come on. Some older cars with aging batteries can experience significant voltage drops during startup, triggering false system alarms. I've handled many such cases, and the simplest solution is to try turning the engine off and restarting it. If the lights remain on, take it to a professional place to scan the OBD trouble codes—don't mess around with small shops, as they might make things worse. Pay attention to your battery's condition regularly; it should be replaced every two to three years, especially in winter when voltage tends to be unstable. In short, get it fixed early to avoid disrupting your driving and creating hidden hazards.
