OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P00FD

Battery B State of Charge Performance

State of charge of battery B (typically auxiliary or hybrid battery) shows performance fault — does not behave according to charging model.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / FD

Possible causes

  • Battery B aged or sulfated high

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 80–600 €
  • Estimated time: 0.3–1.5 h
  • Component: battery b
  • Component: charging system
  • MIL / check engine light
  • drive cycle required

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication