CP_a151 — Bad Pilot Diode Detected

Full alert identifier: CP_a151_badPilotDiodeDetected

Message shown in the car

Charge port error detected - Service is required AC charging may not function / OK to Supercharge

Alert description

The charge port (CP) electronic control unit (ECU) detects the control pilot voltage is outside of the nominal range while using Tesla electric vehicle supply equipment (EVSE), indicating an internal condition on the CP ECU.

Potential impact

AC charging may be unavailable during the next charging session. No expected impact on Supercharging functionality.

Set condition

The CP ECU detects the control pilot voltage did not go below -10V while using Tesla EVSE.

Clear condition

The CP ECU detects a nominal control pilot voltage or the CP ECU is replaced.

Signals to check

Open this alert in Service Mode Plus and review the Payload tab. Use the field names below to identify the values shown by your vehicle.

Signal	Unit
Pilot High Max `CP_a151_pilotHighMax`	V
Pilot High Min `CP_a151_pilotHighMin`	V
Pilot Low Max `CP_a151_pilotLowMax`	V
Pilot Low Min `CP_a151_pilotLowMin`	V

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of CP_a151.