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

P0D03

Control Pilot Charging Ventilation Switch Circuit High

The control pilot charging ventilation switch reports a circuit high condition. Charging ventilation requirement signal compromised (used for indoor charging).

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberD / 03

Possible causes

  • Wire shorted to B+ high
  • Switch open medium
  • Connector pins corroded - high contact resistance low

Symptoms

  • Charge status indicator shows fault
  • Charging may not start or interrupts
  • Slower-than-expected charge rate

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 80–400 €
  • Estimated time: 0.3–2 h
  • Component: control pilot ventilation switch
  • Component: wiring harness
  • Component: bms
  • MIL / check engine light

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