The P0864 trouble code indicates a problem with the transmission control module (TCM) communication circuit, specifically regarding its range or performance. Here’s what you should know:
P0864 TCM Communication Circuit Range/Performance
Code symptoms P0864.
1. Check Engine Light (CEL) illuminated on the dashboard.
2. Difficulty or inability to shift gears smoothly.
3. Harsh shifting or erratic transmission behavior.
4. Transmission may go into limp mode, limiting the vehicle’s speed.
5. Other transmission-related issues may be present.
Causes of the code P0864.
1. Faulty transmission control module (TCM).
2. Damaged or corroded wiring or connectors in the communication circuit.
3. Issues with the powertrain control module (PCM) or other control modules.
4. Poor electrical connections or ground faults.
5. Internal transmission problems.
Code Solutions P0864.
1. Replace the faulty TCM if necessary.
2. Repair or replace damaged or corroded wiring or connectors in the communication circuit.
3. Address any issues with the PCM or other control modules as needed.
4. Clear the trouble codes from the vehicle’s computer after repairs are complete.
5. Test drive the vehicle to confirm that the issue has been resolved.