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

P2305

Ignition Coil B Secondary Circuit

The secondary side of ignition coil B is faulty. Spark energy at the corresponding spark plug is insufficient, producing misfires.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 05

Possible causes

  • Worn spark plug high
  • Coil secondary failure medium

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 40–250 €
  • Estimated time: 0.2–1 h
  • Component: ignition coil
  • Component: spark plug
  • Component: spark plug wire
  • MIL / check engine light
  • emissions-relevant
  • 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