What it means
The transmission control module monitors how long friction element F takes to apply during a commanded gear change. It sets this code when the measured apply time falls outside the expected range.
At a glance
- Usually lights the check-engine light
How it works
The transmission control module monitors how quickly friction element F, an internal clutch or band, applies during a gear change. This code sets when element F's measured apply time falls outside its expected range, pointing to abnormal pressure, hydraulic flow, or friction in that path.
Common causes
Most likely first.
- Worn clutch friction plates
- Pressure control solenoid drift
- Internal hydraulic leak in apply circuit
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
- Save freeze-frame and transmission data, and note which commanded shift triggered the element F apply-time fault.
- Check transmission fluid level and condition according to the manufacturer's procedure because low or degraded fluid can affect element F application.
- Inspect transmission wiring and connectors for damage or poor contact that could disrupt solenoid control.
- Use a scan tool to compare element F apply-time readings with commanded shifts and pressure-control solenoid data.
- If the fault remains unexplained, test line pressure and the element F apply circuit for a leak or restriction before determining whether the clutch is worn.
Common fixes
- Correct fluid level or service fluid that fails the manufacturer's condition requirements.
- Repair damaged transmission wiring or loose connector connections.
- Replace a pressure-control solenoid only if testing confirms a response fault.
- Repair the element F hydraulic circuit or clutch pack if internal leakage or wear is confirmed.
Can I keep driving?
Keep driving to a minimum and avoid towing or hard acceleration, since slipping or shuddering can cause further transmission damage. Stop safely and arrange recovery if the transmission loses drive or shifts unpredictably.
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.