PCS-A104
PCS_a104_ambientTempRationality
Also written as PCS_A104 / PCS A104 / PCS_a104_ambientTempRationality / pcs_a104_ambienttemprationality
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-A104 mean?
Tesla alert code in the Power Conversion System (PCS) module. PCS ambient temperature sensor is reporting an irrational value Ambient temperature is outside of expected range for more than 1s Ambient temperature is within expected range DCDC insufficient cooling check will be disabled if the ambient temp sensor is irrational PCS EEPROM software module has detected an error Power conversion system EEPROM software module has detected an error Clears directly after alert is set Kilowatt-hour counter functionality may be impacted, damaged phase detection may be impacted
Original Description
PCS ambient temperature sensor is reporting an irrational value Ambient temperature is outside of expected range for more than 1s Ambient temperature is within expected range DCDC insufficient cooling check will be disabled if the ambient temp sensor is irrational PCS EEPROM software module has detected an error Power conversion system EEPROM software module has detected an error Clears directly after alert is set Kilowatt-hour counter functionality may be impacted, damaged phase detection may be impacted
Affected Tesla Models
What You May Notice
- Power Conversion System alert: PCS ambient temperature sensor is reporting an irrational value Ambient temperature is outside of expected range for mor
- 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-A104 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.