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2000 BMW 525I
2.5L I6 M54•RWD•AUTOMATIC•gas•M54B25
1 active safety recall on this vehicle — view recalls
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Repairs0Labor498Torque2182Fluid8DTC1244Battery1Maintenance0Recalls1
P1525high severityPowertrain

Variable Valve Timing Actuator Supply Voltage

on 2000 BMW 525i 2.5L I6 M54 · RWD

What this code means

The DME detected that the supply voltage to the VANOS actuator system is out of specification. Proper voltage is critical for the precise electro-hydraulic control of variable valve timing.

Symptoms

  • Check Engine Light
  • VANOS not operating correctly
  • Power loss at various RPMs
  • Rough idle
  • Poor throttle response

Common causes

  • Low battery voltage
  • Corroded wiring or connectors in VANOS circuit
  • Faulty VANOS solenoid coil
  • DME power supply issue
  • High resistance in power feed

Diagnostic steps

  1. Test battery voltage and alternator output
  2. Measure voltage at VANOS solenoid connector
  3. Inspect wiring for corrosion or damage
  4. Test VANOS solenoid coil resistance
  5. Check DME power supply circuits

Repair notes

Repair the voltage supply issue to the VANOS actuator system.

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