What are the reasons for the sudden failure of the Buick Envision headlights?

2 Answers
EmilyDella
08/31/25 8:32am
The reasons for the sudden failure of the Buick Envision headlights are: 1. Bulb burnout, overheating wires, damaged relay or combination switch; 2. Open circuit, short circuit, broken circuit, or grounding of wires; 3. Damaged fuse or poor circuit contact; 4. Battery depletion; 5. Loose headlight connector. Taking the 2021 Buick Envision as an example, it is a mid-size SUV with body dimensions of: length 4694mm, width 1839mm, height 1686mm, wheelbase of 2750mm, and a body weight of 1610kg. The 2021 Buick Envision is equipped with a 1.5T turbocharged engine, with a maximum horsepower of 169PS, maximum torque of 250Nm, maximum power of 124kW, and is paired with a 7-speed dual-clutch transmission.
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Beatrix
09/13/25 4:42am
I've been driving a Buick Envision for several years and have encountered this issue. Sudden headlight failure is quite common, and the causes may include a burnt-out bulb, especially in older models where bulbs wear out over time; a blown fuse is another frequent issue, as excessive current can cause it to burn out, so you'll need to check the fuse box; wiring connection problems, such as loose plugs or aged wires, can lead to short circuits or open circuits; a faulty relay can cause control failure; a broken switch button can prevent the lights from turning on; and sometimes, unstable generator voltage can also damage the bulbs. I recommend starting with the simplest checks, like replacing the bulb. If that doesn't work, you should take it to a professional shop to test the circuit with tools. Safety first—if your lights go out while driving, pull over immediately and turn on your hazard lights to avoid a collision.
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