Shift solenoids are typically located inside the valve body and are used by the computer to control the flow of pressurized hydraulic fluid (also called transmission fluid). If there is an abnormally high signal through the shift solenoid D control circuit, a DTC P0983 will be stored.
How severe is the code?
Diagnostic code P0983 is extremely severe, and the associated transmission problems will eventually leave you with a non-functional vehicle.
Symptoms
Symptoms of a P0983 include:
- Firm shifts
- Transmission cannot shift into gear
Causes
- Dirty fluid/filter
- Low transmission fluid
- Damaged wiring
- Corroded/broken connectors
- Shift solenoid is broken
How to diagnose the code?
The condition and level of the transmission fluid are very important for the operation of the shift solenoid. Therefore, this should be the first thing to check when trying to diagnose an OBDII trouble code P0983. The next thing to consider 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 inspected.
What repairs will fix P0983?
- Service the transmission
- Replace or repair damaged wiring/connectors
- Replace the shift solenoid
Related Codes
P0981 – Shift solenoid “D” control circuit range/performance
P0982 – Shift solenoid “D” control circuit low