ESP-A039
ESP_a039_FrRWSSOpenOrShortToGnd
Also written as ESP_A039 / ESP A039 / ESP_a039_FrRWSSOpenOrShortToGnd / esp_a039_frrwssopenorshorttognd
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 ESP-A039 mean?
Tesla alert code in the Electronic Stability Program (ESP) module. Short circuit of the WSS_FR sensor line to GND or line interruption (sensor or supply line). Invalid Data Received From Pedal Monitor: Data Length Code, Checksum or Parity invalid Internal electronic fault detected on outlet valves. The unit has detected an internal fault in the outlet valves This error will be set if 2 rotation directions of the sensor signal are in one direction, the other 2 rotations are in the other direction OR 2 rotation directions of the sensor signal have no rotation, 1 rotation in one direction, 1 rotation in other direction Check proper mounting of all four WSS. Monitor clears when all wheel speed sensors show the same rotation for 20 seconds. Voltage at ESP supply pins exceeds specifications
Original Description
Short circuit of the WSS_FR sensor line to GND or line interruption (sensor or supply line). Invalid Data Received From Pedal Monitor: Data Length Code, Checksum or Parity invalid Internal electronic fault detected on outlet valves. The unit has detected an internal fault in the outlet valves This error will be set if 2 rotation directions of the sensor signal are in one direction, the other 2 rotations are in the other direction OR 2 rotation directions of the sensor signal have no rotation, 1 rotation in one direction, 1 rotation in other direction Check proper mounting of all four WSS. Monitor clears when all wheel speed sensors show the same rotation for 20 seconds. Voltage at ESP supply pins exceeds specifications
Affected Tesla Models
What You May Notice
- ESP-A039 may appear with another Tesla alert in the Electronic Stability Program (ESP) system.
- The vehicle may limit charging, driving, comfort, or safety features depending on the active alerts.
- The alert may clear after sleep, but recurring alerts should be treated as service-relevant.
How to Diagnose and Resolve
- 1 Reboot the vehicle by holding both scroll wheels
- 2 Check for available OTA software updates
- 3 If alert persists after reboot, schedule a service appointment
Severity Notes
ESP-A039 is an Alert in the Electronic Stability Program system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.