In order to provide manual shifting capability, the auto stick shift switch/transmission shift switch connected to the shifter, sends an electrical signal vehicle’s computer to let it know what gear you would like to actuate. If there is an intermittent problem somewhere between this switch, the mode actuator or the wiring/connectors, a P0959 DTC will be saved.
How Serious is the Code?
The most serious part of a P0959 diagnostic trouble code, is the fact that you will no longer be able to use the manual shifting function.
Symptoms of a P0959 include:
- Manual shifting function is disabled
- Damaged wiring and/or connectors
- Failed Autostick transmission shift switch
How to Diagnose the Code?
In order to diagnose a P0959 OBDII trouble code, your mechanic should start by checking all of the wiring and connectors around the shifter for signs of damage and corrosion. They will also need to check the transmission shift switch sure that it works properly.
What Repairs Will Fix P0959?
- Repair or replace damaged wiring and connectors
- Replace Autostick transmission shift switch