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What are the reasons for the malfunction of the Envision's engine start-stop system?

2 Answers

JaxonLynn

07/29/25 4:59am

The reasons for the malfunction of the Envision's engine start-stop system are: 1. Seatbelt not fastened; 2. Driver's door not closed; 3. Battery temperature too high or too low; 4. Insufficient battery charge; 5. Vehicle positioned on a steep slope; 6. Cabin heating or cooling in progress, yet to reach an acceptable temperature; 7. HVAC system set to full defrost mode with the blower on high speed; 8. Engine not yet reached normal operating temperature, transmission not engaged in forward gear. Taking the 2021 Envision as an example, its body dimensions are: length 4694mm, width 1839mm, height 1686mm, wheelbase 2750mm, and curb weight 1610kg.

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VanElliana

08/12/25 8:38am

With years of experience in auto repair, I've encountered various situations where the Buick Envision's auto start-stop system malfunctions. The most common cause is an aging or undercharged battery, as the system relies on sufficient power to restart the engine. Extreme cold or hot weather can also trigger failures, as temperature sensors automatically disable the system to protect the engine. Additionally, a dirty or faulty brake switch sensor may fail to send signals, making the system think the vehicle is in motion and preventing auto stop activation. Software bugs are another issue, often requiring a firmware update at the dealership. Running the AC at maximum can also interfere, as the system prioritizes continuous engine operation for power supply. I recommend first checking battery health and replacing it if necessary – never underestimate the importance of maintenance.

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