In order for your transmission to execute a gear change, a little plunger device known as a solenoid, opens or closes to direct pressurized transmission fluid down the right channel, where it pushes or otherwise moves parts like clutches or gearsets. If the shift solenoid F (i.e. the sixth solenoid) is not performing according to it’s programmed parameters, a P0997 DTC will be saved.
How Serious is the Code?
The P0997 diagnostic trouble code is only triggered when the ECU detects that a shift solenoid is not working properly. This can result in a number of drivability problems that will eventually lead to a nonworking transmission.
Symptoms of a P0997 include:
- The transmission seems to slam into gear
- The transmission won’t shift into or out of a gear
- There isn’t enough transmission fluid
- The transmission fluid is dirty/thin
- Damaged/broken wires
- Broken/corroded connectors
- Failed shift solenoid
How to Diagnose the Code?
The first thing that should be done when trying to figure out what is causing a P0997 OBDII trouble code, is check the level and condition of the transmission fluid. If it’s too low or dirty, the transmission fluid should be changed. If there are no problems with the transmission fluid condition, then the wiring and connectors along the transmission wiring harness should be inspected. If no problems are found there, then the shift solenoid itself should be tested.
What Repairs Will Fix P0997?
- Service the transmission
- Replace or repair damage wiring/connectors
- Replace shift solenoid
- P0998 – Shift Solenoid “F” Control Circuit Low
- P0999 – Shift Solenoid “F” Control Circuit High