P0E54DC/DC Converter Current Sensor A 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
- P0E54 reports a current sensor A signal above the range the DC/DC converter accepts. Mercedes-Benz uses it explicitly: its bulletin LI54.10-P-079533, covering the EQB (series 243) and the G-Class including the electric G 580 (series 465), defines P0E5400 as a short to positive of the converter's current sensor A. It is one of up to four converter codes, with P0C3B00, P0E9700 and P0C4000, that appear after the converter wakes up incorrectly; drivers see a red 12 V battery message and HV warnings. Mercedes treats it as a state error rather than a broken part: the technician runs the buck mode in XENTRY for about 30 s, checks that output current settles from a high initial value, then clears the memory or resets the converter. The low-signal sibling is P0E53.
- What you may notice
- Red 12 V battery message
- White or yellow high-voltage system warnings
- Reduced drive power
- Likely causes
- LikelyConverter stuck in a fault state after incorrect wake-up (Mercedes 243/465)
- PossibleSignal line shorted to a supply voltage
- RareCurrent sensor or converter electronics defective
- 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.