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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
P0479moderate severityPowertrain

Exhaust Pressure Control Valve Circuit Intermittent

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

What this code means

The exhaust pressure control valve circuit is intermittent for the second sensor/valve. The PCM sees erratic signals affecting backpressure control.

Symptoms

  • Check engine light on
  • Erratic engine performance
  • Reduced power under load

Common causes

  • Intermittent wiring fault
  • Corroded connector
  • Faulty exhaust pressure control valve
  • Bad PCM

Diagnostic steps

  1. Retrieve code and freeze frame
  2. Inspect and wiggle-test wiring
  3. Check valve signal with scan tool
  4. Repair connection or replace valve
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