To provide manual shifting capability, the automatic shift lever switch/transmission range switch connected to the shift lever sends an electrical signal to the vehicle’s computer to let it know which gear you want to engage. If there is an intermittent problem somewhere between this switch, the mode actuator, or the wiring/connectors, a DTC P0959 will be stored.
How severe is the code?
The most serious aspect of a diagnostic code P0959 is that you will no longer be able to use the manual shifting function.
Symptoms
Symptoms of a P0959 include:
- Manual shifting function is disabled
Causes
- Damaged wiring and/or connectors
- Failure of the Autostick transmission shift switch
How to diagnose the code?
To diagnose an OBDII fault code P0959, your mechanic should start by checking all wiring and connectors around the shift lever for signs of damage and corrosion. They will also need to verify that the transmission shift switch is functioning properly.
What repairs will fix P0959?
- Repair or replace damaged wiring and connectors
- Replace the Autostick transmission shift switch