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2005 VOLVO S80
2.9L I6•FWD•AUTOMATIC•gas•B6294S
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor501Torque3156Fluid7DTC1718Battery1Maintenance0Recalls6
P0860high severityPowertrain

Gear Shift Module Communication Circuit

on 2005 Volvo S80 2.9L I6 · FWD

What this code means

The transmission control module has lost communication with the gear shift module or is detecting an error on the data line between them. This can prevent proper gear selection and shifting.

Symptoms

  • Gear position display incorrect or blank
  • Transmission stuck in gear or won't shift
  • Warning light on dash

Common causes

  • Faulty gear shift module
  • Damaged or corroded wiring/connectors
  • Communication bus fault
  • Failed transmission control module

Diagnostic steps

  1. Scan for related communication codes
  2. Inspect gear shift module wiring and connectors
  3. Check communication line for continuity and voltage
  4. Test or replace gear shift module if faulty
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