Shift solenoids are typically located within the valve body, and are used by the computer to control the flow of pressurized hydraulic fluid (a.k.a. transmission fluid). If there is an unusually high-voltage signal coming through on the shift solenoid D control circuit, a P0983 DTC will be saved.
How Serious is the Code?
The P0983 diagnostic trouble code is extremely serious, and the transmission problems associated with it will eventually leave you with a nonworking vehicle.
Symptoms of a P0983 include:
- Firm shifts
- Transmission may not shift into gear
- Dirty transmission fluid/filter
- Low transmission fluid
- Damaged wiring
- Corroded/broken connectors
- The shift solenoid has broken
How to Diagnose the Code?
The condition and level of transmission fluid is really important to the way the shift solenoid functions. So that should be the first thing that is examined and trying to diagnose a P0983 OBDII trouble code. Next thing that should be considered is the condition of the wiring and connectors along the transmission wiring harness. If no broken wires or corroded connectors are found, then the shift solenoid D itself will need to be examined.
What Repairs Will Fix P0983?
- Service the transmission
- Replace or repair damage wiring/connectors
- Replace shift solenoid
- P0981 – Shift Solenoid “D” Control Circuit Range/Performance
- P0982 – Shift Solenoid “D” Control Circuit Low