What it means
Shift solenoid F is commanded on but does not produce the expected hydraulic response. Spool stuck closed or hydraulic apply circuit blocked.
At a glance
- Usually lights the check-engine light
How it works
Shift solenoid F controls a fluid path used for transmission gear changes. This performance or stuck-off code means the controller commanded solenoid F on but did not detect the expected hydraulic or gear response, consistent with a valve that is not opening or a blocked apply passage.
Common causes
Most likely first.
- Solenoid spool stuck in closed position
- Apply circuit blocked by debris in valve body
- Carbon or debris buildup preventing free movement
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame and transmission data to identify the shift where commanded solenoid F failed to produce the expected response.
- Check fluid level and condition using the manufacturer's procedure, and inspect for signs of contamination that could obstruct the solenoid or passage.
- Inspect the solenoid F wiring and connector for damage or poor contact that could prevent the commanded activation.
- Use a scan tool to compare the solenoid F command with transmission response during the affected shift.
- If wiring and command are sound, test solenoid F operation and inspect the valve-body passage for sticking or debris.
Common fixes
- Correct fluid level or service fluid if it is contaminated or outside the manufacturer's requirements.
- Repair a poor connection or damaged wire in the solenoid F circuit.
- Clean or replace solenoid F if it is sticking and testing supports that diagnosis.
- Remove debris or repair a blocked solenoid F passage in the valve body.
Can I keep driving?
Avoid towing, heavy loads, and unnecessary driving because the transmission may miss shifts or slip when solenoid F cannot apply its fluid path. Stop safely and arrange recovery if the vehicle loses drive or shifts erratically.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.