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

P0EA8

DC/DC Converter B Performance

The DC/DC converter B output performance is outside calibration. Output voltage tracking error or efficiency too low.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberE / A8

Possible causes

  • Switching FETs aged high
  • Output capacitor ESR high medium

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 600–3500 €
  • Estimated time: 3–12 h
  • Component: dcdc converter b
  • MIL / check engine light
  • limp mode possible

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