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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
P0858moderate severityPowertrain

TCM Communication Circuit Range/Performance

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

What this code means

The signal from the Transmission Control Module communication circuit is outside the expected range. This can disrupt data exchange between the TCM and other modules.

Symptoms

  • Transmission warning light on
  • Erratic shifting
  • Communication fault codes

Common causes

  • Faulty wiring or connectors
  • Poor ground connection
  • Failed TCM
  • Damaged communication bus

Diagnostic steps

  1. Scan for related communication codes
  2. Inspect TCM wiring and connectors
  3. Check circuit for shorts and opens
  4. Test TCM signal voltage
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