Powertrain, generic · Hybrid propulsion

P0D28 Battery Charger Input Voltage Too High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D28 is the mirror case of P0D27: the AC voltage at the charger input lies above the range the charger can accept. Mitsubishi evaluates both on the Outlander PHEV while the PHEV-ECU allows charging; the charger then stops and the technician works from the outside in, beginning with the supply and the charging cable, then the wiring between inlet and charger, and only last the charger. A real overvoltage is rare on public grids, so a faulty voltage measurement or software is often more likely. Audi lists P0D2800, battery charger primary voltage too high, among ghost DTCs stored by software 0088 in the high-voltage charger module of the e-tron and Q8 e-tron (2021-2024); bulletin 2062631 says to leave them unrepaired unless a charging complaint exists. Sensor faults are P0D3E-P0D40.

Likely causes

Input voltage sensing inside the charger reading too high
Charger software storing the code without a real fault (Audi ghost DTC)
Actual overvoltage or unstable supply at the charging location
Faulty charging cable or EVSE

Symptoms

  • AC charging stops or does not start
  • Code found in memory without any complaint

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–2,000
Time0.3–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

battery chargerac input circuit

Related codes

P0D27P0D40P0D3E

References: mitsubishitechinfo.com, static.nhtsa.gov, law.cornell.edu.