Powertrain
generic / SAE
P0864
TCM Communication Circuit Range/Performance
The Transmission Control Module communication circuit reports a communication circuit range/performance fault. Data exchange between TCM and ECM is impaired.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number8 / 64
Possible causes
- Communication bus fault high
- TCM internal fault medium
- Gateway module routing CAN messages incorrectly low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–5 h
- Component: tcm
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012