P0E9DDC/DC Converter Current Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E9D reports that the signal of DC/DC converter current sensor B has dropped below its valid range. Porsche documents it for the Taycan of model years 2020 to 2024 as P0E9D00, current sensor 2 of the converter with a short to ground, logged by the HV power electronics on the front axle (A49), the rear axle (A50) or both. A red warning tells the driver to stop safely because of an electrical fault, yet once the ignition has been cycled the entry is no longer active. Porsche blames a diagnostic threshold for current monitoring that was set too low and reprograms both control units, using PIWIS Tester version 43.500.000 or newer. Outside that case a real ground short or a dead sensor supply is the likely cause. The high counterpart is P0E9E.
- What you may notice
- Red warning to stop the vehicle safely
- Fault no longer active after an ignition cycle
- Drive power reduced or vehicle not ready to drive
- Likely causes
- LikelyCurrent monitoring threshold set too low in the software
- PossibleSensor B signal shorted to ground
- RareSensor supply missing inside the power electronics
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.