What it means
The control module detects a range or performance problem in the shift solenoid F control circuit.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Shift solenoid F is an electrically operated valve that helps route transmission fluid for gear changes. The control module monitors the solenoid F control circuit and sets this code when its electrical behavior or response falls outside the expected range or performance.
Common causes
Most likely first.
- Faulty shift solenoid F
- Open, shorted, or high-resistance wiring or connection
- Transmission control module fault
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 data and review transmission live data for commanded solenoid F operation and any related shift or pressure abnormalities.
- Inspect the solenoid F connector and accessible harness for loose terminals, corrosion, fluid contamination, chafing, or damaged insulation.
- Check the transmission fluid level and condition using the vehicle's specified procedure, since fluid problems can affect shift behavior even when the circuit is at fault.
- Test the solenoid F circuit for opens, shorts, and excessive resistance using the wiring diagram and manufacturer's specifications.
- Test solenoid F's coil and operation according to the manufacturer's procedure, then assess the transmission control module only after the solenoid and wiring pass.
Common fixes
- Repair a loose or corroded solenoid F connector.
- Repair damaged or high-resistance wiring in the solenoid F circuit.
- Correct transmission fluid level or condition if it is outside the specified range.
- Replace shift solenoid F if testing confirms it does not meet specification.
- Repair or replace the transmission control module if testing isolates the fault there.
Can I keep driving?
If shifting is harsh, delayed, slipping, or limited to one gear, avoid driving farther than needed to reach a safe repair location; towing is safer if control is unreliable. Continued slipping can overheat and damage the transmission.
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.