VCLEFT-A339
VCLEFT_a339_trailerLeftTurnLightNotDetected
Also written as VCLEFT_A339 / VCLEFT A339 / VCLEFT_a339_trailerLeftTurnLightNotDetected / vcleft_a339_trailerleftturnlightnotdetected
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
What does VCLEFT-A339 mean?
Tesla alert code in the Vehicle Controller Left (VCLEFT) module. Trailer left turn light faulted or not detected Left turn light trailer light is not plugged in to trailer or its efuse has tripped Connect a left turn trailer light or toggle trailer mode Left turn indicator on trailer may not operate properly Electronic Parking Brake Monitor detected Electronic Parking Brake driving the motor the incorrect direction for the given state. Electronic Parking Brake Monitor detected Electronic Parking Brake driving the motor the incorrect direction for the given state from the voltage measured across the motor. EPB operation may be reversed. Steering Wheel Controller input voltage is above maximum of 18V Steering Wheel Controller input voltage is below maximum of 18V
Original Description
Trailer left turn light faulted or not detected Left turn light trailer light is not plugged in to trailer or its efuse has tripped Connect a left turn trailer light or toggle trailer mode Left turn indicator on trailer may not operate properly Electronic Parking Brake Monitor detected Electronic Parking Brake driving the motor the incorrect direction for the given state. Electronic Parking Brake Monitor detected Electronic Parking Brake driving the motor the incorrect direction for the given state from the voltage measured across the motor. EPB operation may be reversed. Steering Wheel Controller input voltage is above maximum of 18V Steering Wheel Controller input voltage is below maximum of 18V
Affected Tesla Models
What You May Notice
- Vehicle Controller Left alert: Trailer left turn light faulted or not detected Left turn light trailer light is not plugged in to trailer or its efuse
- Some features (climate, lights, or charging) may be temporarily unavailable
- Alert notification in the Tesla app
How to Diagnose and Resolve
- 1 Perform a soft reboot (hold both scroll wheels)
- 2 Check for pending OTA software updates in Controls > Software
- 3 If multiple features remain non-functional, schedule a service appointment
Severity Notes
VCLEFT-A339 is an Alert in the Vehicle Controller Left system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.