P0D28: Battery Charger Input Voltage Too High

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.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• Repair difficulty: medium

What each character of P0D28 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• D: Subsystem depends on the code range
• 28: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D28?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0D28?

The most common causes are: 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.

Related codes

• P0D27Battery Charger Input Voltage Too Low
• P0D40Battery Charger A Input Voltage Sensor A Circuit High
• P0D3EBattery Charger A Input Voltage Sensor A Circuit Range/Performance

Sources

• mitsubishitechinfo.com: M154950390001600USA
• static.nhtsa.gov: MC 11005978 0001
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.