P0860
PowertrainModule Communicationhigh severityGear Shift Module Communication Circuit
What P0860 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
- Scan for related communication codes
- Inspect gear shift module wiring and connectors
- Check communication line for continuity and voltage
- Test or replace gear shift module if faulty
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