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

P25E3

B Camshaft Position - Stuck In Locked Position Bank 1

Camshaft phaser B on bank 1 will not unlock from its base position. The phaser stays at the park-lock angle and cannot be advanced or retarded as commanded.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / E3

Possible causes

  • Park-lock pin stuck in the locked groove high
  • Low oil pressure cannot push the lock pin out medium
  • Oil control valve blocked by debris medium

Symptoms

  • Check engine light on
  • Power loss especially in mid-rpm range
  • Possible rough idle or stalling
  • Increased fuel consumption

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 200–1500 €
  • Estimated time: 1.5–5 h
  • Component: cam phaser b b1
  • Component: park lock pin
  • Component: oil control valve
  • 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