A shift solenoid is a small electromechanical device that the ECU uses to direct the flow of pressurized hydraulic fluid throughout the transmission. If it is not functioning properly, a DTC P0975 will be recorded.
How severe is the code?
Diagnostic code P0975 means that the computer is unable to control shifts, which will leave you with a number of driving issues, including a complete failure to shift gears.
Symptoms
Symptoms of a P0975 include:
- Generally harsh gear shifts
- The transmission cannot shift into gear
Causes
- Transmission fluid is too low or too dirty
- Damaged wiring and/or connectors
- Faulty shift solenoid
How to diagnose the code?
The first thing a technician should do when trying to diagnose an OBDII fault code P0975 is to check the level and condition of the transmission fluid. The next thing they should do is check the condition of the wiring and transmission connector cable harnesses. If no dirty transmission fluid, damaged wires, or broken connectors are found, the shift solenoid itself will need to be tested.
What repairs will fix P0975?
- Service the transmission
- Replace or repair damaged wires/connectors
- Replace the shift solenoid