Error code
OBD2 P0864
OBD2P0864
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
TCM Communication Circuit Range/Performance.
Severity
moderateCan drive, but shifting may be affected and the vehicle could enter 'limp mode'.
Summary
P0864 indicates a problem with communication between the transmission control module (TCM) and other modules in the vehicle's network.
Symptoms
- Transmission shifts poorly
- Stuck in 'limp mode'
- Illuminated check engine light
Common Causes
- Problem with TCM
- Faulty wiring or poor connection to TCM
- CAN bus issues
Diagnosis
- Clear code and check if it returns
- Inspect TCM connector for physical damage or poor connections
- Verify TCM is inactive on network using a scan tool
- Check power supply to TCM
- Test data communication lines
Fixes
- Replace faulty wiring, connectors, or the TCM itself
FAQ
What should I do if clearing the code doesn't solve P0864?
Inspect the TCM and its connections for any physical damage or poor connections. If issues persist, consult a professional mechanic.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
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- P08031-4 Upshift (Skip Shift) Solenoid Control Circuit
- P08041-4 Upshift (Skip Shift) Lamp Control Circuit
- P0805Clutch Position Sensor Circuit
- P0806Clutch Position Sensor Circuit Range/Performance
- P0807Clutch Position Sensor Circuit Low
- P0808Clutch Position Sensor Circuit High
- P0809Clutch Position Sensor Circuit Intermittent
- P0810Clutch Position Control Error
- P0811Excessive Clutch Slippage