In order to prevent you from accidentally shifting out of Park, modern vehicles are equipped with a part called the gear shift interlock solenoid, which releases the gear shift lock button when you put your foot on the brake pedal. A P0930 DTC means that there is an unusually low voltage signal coming from the gear shift lock solenoid.
How Serious is the Code?
If your vehicle has a P0930 diagnostic trouble code, you will likely not be able to shift your vehicle into or out of Park. These transmission problems may be caused by a number of things, including water damage around the shifter, and low or dirty transmission fluid.
Symptoms of a P0930 include:
- The transmission cannot be shifted out of Park
- The transmission fluid is too low or too dirty
- Low battery voltage
- Bad fuse(s) or fusible link(s)
- Wiring or connector damage
- Gear shift lock solenoid failure
- Brake light switch failure
How to Diagnose the Code?
One of the first steps that should be taken when diagnosing a P0930 OBDII trouble code, is to check the condition of the transmission fluid and battery voltage. Any fuses, relays and fusible links should also be checked. Next, all of the wiring and connectors between the shifter and the gear shift lock solenoid should be checked for signs of damage and corrosion. Should nothing be found up to this point, then the gear shift lock solenoid and possibly the brake light switch will need to be tested.
What Repairs Will Fix P0930?
- Change the transmission fluid/filter
- Charge or replace the battery
- Replace any blown fuses or fusible links
- Replace any damage wiring or connectors
- Replace gear shift interlock solenoid
- Replace brake light switch