One problem related to horn assembly has been reported for the 2018 Chevrolet Volt. The most recently reported issues are listed below.
When fully stopped and in park, turning car off, message appears 'shift to park' car is already in park. Upon pushing start to turn car off, most lights etc. Turn off except the speedo display. No way to turn it off. Car horn honks upon exiting car with keys. Speedo lights stay on, draining battery battery and possibly tempting a car thief.
| Electrical System problems | |
| Battery Propulsion System problems | |
| Horn Assembly problems |