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2000 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas•M52B28
1 active safety recall on this vehicle — view recalls
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Repairs0Labor495Torque3158Fluid8DTC1997Battery1Maintenance0Recalls1
P0644moderate severityPowertrain

Driver Display Serial Communication Circuit

on 2000 BMW 528i 2.8L I6 M52 · RWD

What this code means

The PCM has lost or detected a fault in serial communication with the driver information display or instrument cluster. This can prevent warning messages and gauges from working correctly.

Symptoms

  • Blank or frozen driver display
  • Warning lights inoperative
  • Intermittent gauge readings

Common causes

  • Faulty wiring or connector to display
  • Bad serial communication circuit
  • Failed instrument cluster
  • PCM fault

Diagnostic steps

  1. Scan for related communication codes
  2. Inspect display wiring and connectors
  3. Check voltage and ground at cluster
  4. Test PCM communication output
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