What causes the Infiniti Q50L start-stop system to malfunction?

[DeAndres]

Infiniti Q50L start-stop system malfunction reasons: The vehicle's electrical circuit system has failed, it is recommended to contact the local 4S store for inspection as soon as possible. How to use the start-stop system: The driver sits in the cockpit, the red light at the intersection ahead turns on, the driver steps on the brake pedal, stops and shifts out of gear. The Start-Stop system automatically detects: the engine idles and no gear is engaged; the wheel speed sensor of the anti-lock system shows zero; the electronic battery sensor shows sufficient energy for the next start. The Infiniti Q50L has a length, width, and height of 4867mm, 1823mm, and 1456mm respectively, with a wheelbase of 2898mm.

[EverlyLee]

When driving my Infiniti Q50L, the start-stop system malfunctioned, which is often caused by insufficient battery power due to aging, leading the system to automatically deactivate. The start-stop system requires stable voltage support, especially since AGM batteries degrade quickly in capacity after prolonged use and stop functioning. Additionally, sensor misdetections, such as wheel speed or engine temperature sensors, can also cause it to fail—like when sensors become sluggish in cold winters, rendering the system ineffective, though this isn’t a real issue. The impact is increased fuel consumption and emissions, and I’ve noticeably had to refuel more often during city commutes. The diagnostic method is simple: I bought an OBD scanner to read the codes, and if P0562 appears, it indicates an electrical problem. For prevention, regular battery replacement and sensor cleaning can help avoid issues—don’t wait until it worsens and causes engine starting difficulties, affecting the entire vehicle system. Testing battery health during routine maintenance is a hassle-free and cost-effective measure.

[VanTessa]

As a Q50L owner, the start-stop system malfunction is really annoying while driving. Designed to save fuel, it fails at critical moments. The main reason is likely a failing battery; the original battery tends to degrade after three or four years, leading to unstable voltage and system shutdown. Or, the start-stop function may be restricted due to unsuitable temperatures—common in both hot and cold weather. Poor sensor contact can also trigger false alarms; I once had a dirty brake switch causing failure, which was fixed after cleaning. This issue affects daily driving, increases fuel consumption, and raises emissions, harming the environment. It's best to visit a repair shop for inspection rather than DIY attempts, as a dead battery could leave you stranded. I learned that monthly voltage checks are essential—replace if it drops below 12V. Regular maintenance habits help avoid such troubles.

[MacEzra]

After driving the Infiniti Q50L for ten years, the start-stop malfunction is mostly due to a weak battery, causing the system to shut down. The main reason is insufficient voltage from an old battery, and replacing it with a new one will solve the issue. Dirty brake sensors or wheel speed sensors can also cause misjudgment, and cleaning them will fix the problem. The system may not activate when temperatures are too low or too high, which is a normal protective measure and nothing to worry about. Replace the battery early to avoid starting difficulties and ensure driving safety. Regularly check the battery; replace it if the indicator changes color.