P0E9EDC/DC Converter Current Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E9E flags the B current channel of a DC/DC converter reading above its ceiling: the raw signal lies above anything the sensor should output. With a Hall sensor whose zero lies mid-scale, this usually means the signal line touches the supply or the reference ground has opened. No manufacturer documents P0E9E publicly. Mercedes-Benz shows the same fault type on the first channel: on the EQB and G-Class, P0E5400 denotes a short to battery plus on the converter's current sensor A and shows up with red 12 V and HV warnings after a faulty wake-up; the workshop checks it with a buck-mode test of about 30 s in XENTRY and then resets the converter. Porsche calls the B channel current sensor 2 and has its low fault as P0E9D. A real overcurrent belongs to P0D33.
- What you may notice
- Red 12 V battery or HV warning
- Converter stops supplying the 12 V network
- Reduced drive power possible
- Likely causes
- LikelySensor B signal shorted to supply voltage
- PossibleOpen reference ground of the current sensor
- RareConverter in an error state after wake-up, cleared by reset
- 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: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.