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2001 BMW 525I
2.5L I6 M54•RWD•AUTOMATIC•gas•M54B25
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor491Torque672Fluid8DTC2001Battery1Maintenance0Recalls4
P1570critical severityPowertrain

Engine Immobilizer Power Stage Circuit

on 2001 BMW 525i 2.5L I6 M54 · RWD

What this code means

The DME detected a fault in the engine immobilizer (EWS) power stage circuit. The EWS system is not properly communicating with the DME, preventing engine start authorization. This is a critical anti-theft system fault.

Symptoms

  • Engine cranks but will not start
  • Immobilizer warning light on
  • No fuel injection pulse
  • No spark output
  • Key symbol on dashboard

Common causes

  • Faulty EWS module
  • EWS-DME synchronization lost
  • Damaged EWS antenna ring around ignition
  • Key transponder failure
  • DME EWS alignment data corrupted

Diagnostic steps

  1. Check EWS communication with scan tool
  2. Test EWS antenna ring signal
  3. Verify key transponder function
  4. Check EWS-DME alignment status
  5. Inspect wiring between EWS and DME

Repair notes

Re-synchronize the EWS module with the DME using BMW diagnostic software; replace EWS module or key if defective.

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