The P0955 trouble code relates to the auto shift manual mode circuit, indicating an open circuit.
P0955 Auto Shift Manual Mode Circuit/Open
Code symptoms P0955.
1. Inability to engage auto shift manual mode.
2. Erratic shifting behavior.
3. Poor transmission performance.
4. The Check Engine Light (CEL) may be illuminated.
Causes of the code P0955.
1. Faulty auto shift manual mode switch.
2. Wiring or connector issues in the auto shift manual mode circuit.
3. Faulty transmission control module (TCM).
4. Electrical issues in the transmission system.
Code Solutions P0955.
1. Test and replace the auto shift manual mode switch if it is faulty.
2. Inspect the wiring and connectors in the auto shift manual mode circuit for any damage, corrosion, or loose connections. Repair or replace any damaged wiring or connectors.
3. Diagnose and replace the faulty transmission control module (TCM) if necessary.
4. Check for other electrical issues in the transmission system and repair as necessary.