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2000 BMW X5 4.4I E53
4.4L V8 M62•AWD•AUTOMATIC•gas•M62B44
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor489Torque2160Fluid10DTC1997Battery1Maintenance0Recalls6
P0066moderate severityPowertrain

Air Assisted Injector Control Circuit or Circuit Low

on 2000 BMW X5 4.4i E53 4.4L V8 M62 · AWD

What this code means

The air assisted injector control circuit is showing low voltage or an open condition. This affects how fuel is atomized during injection.

Symptoms

  • Rough idle
  • Reduced fuel economy
  • Check engine light on

Common causes

  • Faulty injector air control valve
  • Wiring open or short to ground
  • Corroded connector
  • Failed PCM driver

Diagnostic steps

  1. Scan for related codes
  2. Inspect injector air control wiring
  3. Test circuit voltage and continuity
  4. Check PCM output signal
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