A Tesla owner driving a test version of the Full Self-Driving software (FSD) noted that the system mistook the moon in the sky for a traffic light.
As a result, the car kept trying to slow down on the highway.
Tesla owner Jordan Nelson shares a video of the incident on Twitter.
In the text accompanying the video, he addresses Tesla CEO Elon Musk.
"I think your team should take a look at this. The car thinks the moon is an orange light and therefore wants to slow down."
Musk has not responded to the tweet.
Braking in this autonomous driving mode can also be circumvented by the human driver by simply pressing the accelerator again.
The FSD software has since been introduced in the United States.
Tesla owners can use the features for $199 per month or a one-time payment of $10,000.
With the software, a Tesla is not fully self-driving.
However, the car can adjust the speed itself, recognize objects on the road, keep a distance and assist when changing lanes.
Tesla autopilot mistakes moon for traffic light