P0D90Battery Charger Input Frequency Incorrect
- Generic OBD-II code · Powertrain
- How the car detects it
- P0D90 is stored when the AC supplied to the on-board charger does not have a believable mains frequency. No official manufacturer document available to the public names the code with a threshold. A Ford patent on charger-to-EVSE detection describes the obvious method: after the pilot signal is present and S2 is closed, the charger measures the interval between successive zero passes of the incoming AC, increments an error counter whenever the result is under 40 Hz or over 70 Hz and stores a code after a set number of errors. The patent notes that the frequency fault need not stop charging, and that a frequency error together with a lost pilot is treated as the higher-ranking loss of AC power. Unstable sources such as small generators or faulty portable EVSEs are the usual trigger; often the driver notices nothing at all.
- What you may notice
- Often no noticeable effect apart from the stored code
- Charging interrupted at certain supply points
- Likely causes
- LikelyCharging from a source with unstable frequency (small generator, inverter)
- PossibleFaulty portable charging unit or wall box
- RareFault in the charger's frequency measurement
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.