PCS-A090
PCS_a090_expectedAcVoltageSourceMissing
Also written as PCS_A090 / PCS A090 / PCS_a090_expectedAcVoltageSourceMissing / pcs_a090_expectedacvoltagesourcemissing
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-A090 mean?
Tesla alert code in the Power Conversion System (PCS) module. PCS detects one or more power converter expected AC voltage sources are missing, possibly due to bad utility wiring or vehicle HV harness connection Charger detects that one or more expected AC voltage sources is missing, possibly due to bad external wiring Charger state machine retries or charge cable is cycled
Original Description
PCS detects one or more power converter expected AC voltage sources are missing, possibly due to bad utility wiring or vehicle HV harness connection Charger detects that one or more expected AC voltage sources is missing, possibly due to bad external wiring Charger state machine retries or charge cable is cycled
Affected Tesla Models
What You May Notice
- Power Conversion System alert: PCS detects one or more power converter expected AC voltage sources are missing, possibly due to bad utility wiring or v
- 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-A090 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.