To change an automatic transmission like a manual one, a switch connected to the gear lever must send an electrical signal to the TCM whenever you push the gear lever in the +/- direction. This tells a sensor on the valve body which gear you want to engage. If there is a problem with any of the components in the automatic transmission manual shift mode circuit, a DTC P0955 will be recorded.
How severe is the code?
Transmission issues related to a diagnostic code P0955 will likely not leave you stranded on the side of the road. However, they will prevent you from using the manual shift function.
Symptoms
Symptoms of a P0955 include:
- Manual shift function disabled
Causes
- Damaged wiring or connectors
- Failure of the Autostick transmission shift switch
How to diagnose the code?
To diagnose an OBDII fault code P0955, your mechanic will need to check the gear lever mechanism for signs of moisture damage, due to possible spills around the gear lever. The Autostick shift switch must be tested to ensure it is functioning, and the wiring/connectors should be checked for signs of damage and corrosion.
What repairs will fix P0955?
- Repair or replace damaged wiring and connectors
- Replace the Autostick transmission shift switch