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

P255B

PTO Speed Selector Sensor/Switch 2 Range/Performance

PTO speed selector switch 2 is electrically intact but its value does not match a valid bit pattern — multiple positions asserted, or values that do not map to any preset.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 5B

Possible causes

  • Contaminated rotary contact high
  • Sensor element aged beyond calibration window low
  • Sensor mounting loose - signal damping low

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 60–350 €
  • Estimated time: 0.3–1.5 h
  • Component: pto speed selector 2
  • 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