P0863

Symptoms

• Incorrect gear shifting
• The gearbox goes into emergency mode
• Check Engine Light Is On
• Reduced engine power
• Other related trouble codes appear

Causes

• Open or short circuit in TCM communication circuit
• Poor contact in TCM connectors
• TCM module malfunction
• TCM power or ground problems
• Malfunction of other associated electronic components

How to Fix

1. Check the integrity of the wires in the TCM communication circuit
2. Inspect and clean contacts in TCM connectors
3. Check TCM power and ground
4. Scan other electronic components for errors
5. Replace TCM if necessary

Related codes

Error P0863 by Vehicle Brand