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

P27B9

Pressure Control Solenoid N Performance/Stuck Off

Pressure control solenoid N is commanded on but does not produce the expected pressure.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / B9

Possible causes

  • Solenoid spool stuck in closed position high
  • Hydraulic feed restricted by debris medium
  • Carbon or debris buildup preventing free movement low

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 300–2500 €
  • Estimated time: 2–8 h
  • Component: pressure control solenoid n
  • Component: valve body
  • 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