P1023 – VANOS Solenoid B Stuck (BMW)

Description

P1023 BMW indicates VANOS solenoid B is stuck and not moving as commanded.

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Symptoms

  • Hesitation
  • Reduced power
  • Rough idle

Causes

  • Oil sludge
  • Solenoid sticking
  • Mechanical blockage

Diagnosis

  • Check solenoid movement
  • Inspect oil
  • Scan DME

Repair

  • Replace solenoid
  • Change oil
  • Clean oil passages