PCS-A103
PCS_a103_pchgWithLowLvDetected
Also written as PCS_A103 / PCS A103 / PCS_a103_pchgWithLowLvDetected / pcs_a103_pchgwithlowlvdetected
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 PCS-A103 mean?
Tesla alert code in the Power Conversion System (PCS) module. PCS detected that the LV bus voltage enetered the foldback region during the HV bus precharge PCS has detected at least one reset during the boot up process. AC charging power might be limited if phase damaged is detected Power conversion system detected reset while enabling a phase Reduced AC charge rate or inability to AC charge if pahse damaged is detected PCS intermediate bus voltage behavior is irrational, may indicate a hardware issue Charger detects phase temperature is high Charger phase temperature exceeds derating start threshold for more than five seconds Charger phase temperature is below derating start threshold for more than five seconds PCS DCDC detects 12V bus voltage is higher than the safety threshold to continue its operation DCDC converter detects that low voltage bus voltage exceeds overvoltage threshold PCS detects grid frequency droop below a certain level AC charging will be blocked to reduce load for the grid Charger phase temperature is irrational Charger phase temperature is outside expected range for more than one second Charger phase temperature is within expected range PCS does not receive CAN messages from UI High DC offset present on charger input current sensor when charge functionality is not enabled. Indicates issue with vehicle if seen multiple times over multiple days. Charger line current sensor DC offset exceeds threshold for more than three seconds while charging is inactive Charger line current sensor DC offset is below clear threshold for more than 500ms
Original Description
PCS detected that the LV bus voltage enetered the foldback region during the HV bus precharge PCS has detected at least one reset during the boot up process. AC charging power might be limited if phase damaged is detected Power conversion system detected reset while enabling a phase Reduced AC charge rate or inability to AC charge if pahse damaged is detected PCS intermediate bus voltage behavior is irrational, may indicate a hardware issue Charger detects phase temperature is high Charger phase temperature exceeds derating start threshold for more than five seconds Charger phase temperature is below derating start threshold for more than five seconds PCS DCDC detects 12V bus voltage is higher than the safety threshold to continue its operation DCDC converter detects that low voltage bus voltage exceeds overvoltage threshold PCS detects grid frequency droop below a certain level AC charging will be blocked to reduce load for the grid Charger phase temperature is irrational Charger phase temperature is outside expected range for more than one second Charger phase temperature is within expected range PCS does not receive CAN messages from UI High DC offset present on charger input current sensor when charge functionality is not enabled. Indicates issue with vehicle if seen multiple times over multiple days. Charger line current sensor DC offset exceeds threshold for more than three seconds while charging is inactive Charger line current sensor DC offset is below clear threshold for more than 500ms
Affected Tesla Models
What You May Notice
- Power Conversion System alert: PCS detected that the LV bus voltage enetered the foldback region during the HV bus precharge PCS has detected at least
- DC-DC converter issue may affect 12V system (lights, accessories)
- Alert shown in the Tesla app
How to Diagnose and Resolve
- 1 Reboot the vehicle
- 2 Check if 12V accessories (lights, door handles) are behaving normally
- 3 Schedule a Tesla Service appointment for PCS inspection
Severity Notes
PCS-A103 is an Alert in the Power Conversion System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.