Why are all the warning lights on in the Roewe RX5?

2 Answers
MacGavin
08/31/25 4:25am
Here are the reasons why all the dashboard lights are on in the Roewe RX5: 1. CAN bus failure in the ECU, or poor contact in the ECU's CAN interface. 2. Excessive dirt and carbon deposits, causing abnormal air flow, which prevents accurate control of the normal intake air volume, 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 indicator lights on the dashboard: 1. First category: Daily indicator lights, such as turn signal lights, light indicators, seat belt indicators, cruise control indicators, and parking indicators, all belong to this category. They only serve to indicate the working status of various vehicle functions. 2. Second category: Warning indicator lights, such as the fuel level indicator and windshield washer fluid level indicator. 3. Third category: Fault indicator lights, including the engine (exhaust system) fault light, oil system fault light, battery and power generation system fault light, etc. These fault indicator lights rarely come on under normal circumstances.
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LaLydia
09/12/25 7:44am
That day, I was driving my Roewe RX5 into town for some errands when suddenly all the warning lights on the dashboard lit up, scaring me so much that I quickly pulled over, almost causing an accident. After checking, I found out it was due to the battery voltage being too low, causing the system to falsely report all sorts of issues, because the battery was old and hadn't been replaced for nearly three years. I measured it with a multimeter, and the voltage was only 10V, whereas it should be above 12V to be stable. I quickly borrowed some jumper cables to start the car and drove to the auto repair shop to replace the battery, after which everything returned to normal. The Roewe has a lot of electronic systems, so when the voltage is unstable, it tends to light up the warning lights. My advice is, if you encounter this situation, first pull over and check the battery connections and voltage. Don't risk driving it, as breaking down halfway would be even more troublesome. Remember to regularly check the battery's lifespan to avoid getting into a sticky situation.
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