The P0956 trouble code relates to the auto shift manual mode circuit, indicating a range or performance issue.
P0956 Auto Shift Manual Mode Circuit Range/Performance
Code symptoms P0956.
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 P0956.
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. Mechanical issues in the transmission.
Code Solutions P0956.
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 mechanical issues in the transmission, such as linkage problems, and repair as necessary.