PCS-A042
PCS_a042_dcdcEnableLineMismatch
Also written as PCS_A042 / PCS A042 / PCS_a042_dcdcEnableLineMismatch / pcs_a042_dcdcenablelinemismatch
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-A042 mean?
Tesla alert code in the Power Conversion System (PCS) module. PCS DCDC hardware enable line does not match CAN signal DCDC converter detects that sensed enable hardline state does not match state reported on CAN for more than five seconds DCDC converter detects that sensed enable hardline state matches state reported on CAN for more than one second AC charging is stopped because DCDC is too hot DCDC converter temperature exceeds threshold for more than five seconds while AC charging is active DCDC converter temperature is below clear threshold for more than twenty seconds Charger output voltage sensor mismatches high voltage processor's sensed value on CAN Charger output voltage sensor mismatches high voltage processor's sensed value on CAN for more than three seconds Charger output voltage sensor value matches high voltage processor's sensed value on CAN for more than 500ms PCS charging input RMS over-voltage Charger RMS AC input voltage exceeds overvoltage threshold
Original Description
PCS DCDC hardware enable line does not match CAN signal DCDC converter detects that sensed enable hardline state does not match state reported on CAN for more than five seconds DCDC converter detects that sensed enable hardline state matches state reported on CAN for more than one second AC charging is stopped because DCDC is too hot DCDC converter temperature exceeds threshold for more than five seconds while AC charging is active DCDC converter temperature is below clear threshold for more than twenty seconds Charger output voltage sensor mismatches high voltage processor's sensed value on CAN Charger output voltage sensor mismatches high voltage processor's sensed value on CAN for more than three seconds Charger output voltage sensor value matches high voltage processor's sensed value on CAN for more than 500ms PCS charging input RMS over-voltage Charger RMS AC input voltage exceeds overvoltage threshold
Affected Tesla Models
What You May Notice
- Power Conversion System alert: PCS DCDC hardware enable line does not match CAN signal DCDC converter detects that sensed enable hardline state does no
- 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-A042 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.