Why Are All the Dashboard Warning Lights On?
2 Answers
Here are the reasons why all the dashboard warning lights in a car may illuminate: 1. CAN bus failure in the ECU, or poor contact at the ECU's CAN interface. 2. Excessive dirt and carbon deposits, causing abnormal air circulation and inaccurate control of normal air intake, leading to unstable gas content and poor engine performance. 3. Low fuel pressure combined with poor constant pressure performance results in low system atomization levels, making the car difficult to start. Below are the types of dashboard indicator lights: First category: Routine indicator lights, such as turn signal lights, light indicators, seat belt indicators, cruise control indicators, and parking indicators, which serve to indicate the operational status of various vehicle functions. Second category: Warning indicator lights, such as the fuel level indicator and windshield washer fluid level indicator. Third category: Fault indicator lights, including the engine (exhaust system) fault light, oil system fault light, and battery and charging system fault light. These fault indicators rarely light up under normal circumstances.
When I was driving on the highway for a long distance, all the dashboard lights suddenly lit up, which gave me a scare. After checking some information, I found out that this is mostly caused by insufficient battery voltage or alternator failure. If the system voltage is unstable when starting the car, the dashboard control module may falsely report all warning lights turning on. You can first check if the battery terminals are loose or corroded, and use a multimeter to measure whether the voltage is below 12 volts. My friend's car also had this issue, and it turned out the alternator belt was broken, causing insufficient charging. These kinds of faults are really annoying—not only do they affect driving safety, but they may also falsely report ABS or airbag problems. I suggest you don't push your luck; find a reliable repair shop to diagnose the fuses and wiring to avoid the risk of breaking down halfway. Regular battery checks can reduce this kind of trouble.
