Why did Mercedes-Benz suddenly limit to 20?
2 Answers
Mercedes-Benz suddenly limiting to 20 is because the speed limiter switch was activated. Here are additional details: 1. Reasons: The electronic speed limiter function was turned on, indicated by LIM on the dashboard, or manual mode was engaged without automatic gear shifting. Another possibility is that the handbrake was not released. 2. Cruise Control: Cruise control is the most common feature. The basic operation involves activating cruise mode and then setting the desired speed, allowing you to release the accelerator while maintaining the current speed. During driving, you can adjust the speed using the control buttons (lever). To cancel cruise control, simply apply the brakes or turn off the cruise switch.
When a Mercedes suddenly limits speed to 20 km/h, it often means the vehicle has entered emergency protection mode. I experienced a similar situation while driving my Mercedes when the transmission fluid temperature triggered the speed restriction, forcing me to crawl to the repair shop. Common causes include engine sensor failure, transmission solenoid valve sticking, or electronic control system misjudgment. Avoid forcefully pressing the accelerator as it may worsen the damage. Use an OBD scanner to read the fault codes as soon as possible—typically transmission-related codes like P0700. Replacing a small component or resetting the control module usually solves the issue. For safety, pulling over immediately and calling a tow truck is the most prudent approach.
