The P0861 trouble code indicates a problem with the gear shift module communication circuit being low.
P0861 Gear Shift Module Communication Circuit Low
Code symptoms P0861.
1. Check Engine Light (CEL) illuminating on the dashboard.
2. Difficulty or inability to shift gears.
3. Transmission may go into limp mode, limiting the vehicle’s speed.
4. Other transmission-related issues may be present.
Causes of the code P0861.
1. Faulty gear shift module.
2. Damaged or corroded wiring or connectors in the communication circuit.
3. Issues with the transmission control module (TCM).
4. Poor electrical connections or ground faults.
5. Internal transmission problems.
Code Solutions P0861.
1. Replace the faulty gear shift module if necessary.
2. Repair or replace damaged or corroded wiring or connectors in the communication circuit.
3. Address any issues with the TCM or other transmission components 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.