What it means
The control module detects a high electrical level 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 control transmission fluid flow for gear changes. This code sets when the control module detects a higher electrical level than expected in the solenoid F control circuit, which can happen with a short to battery voltage or an open coil.
Common causes
Most likely first.
- Control wire shorted to B+
- Open solenoid coil
- Connector pins corroded - high contact resistance
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 live transmission data for solenoid F commands and shift problems associated with the fault.
- Inspect the solenoid F connector and harness for damaged insulation, wiring touching a power feed, corrosion, or terminals that are loose or pushed back.
- Using the wiring diagram, check the solenoid F control wire for a short to battery voltage according to the manufacturer's procedure.
- Test the solenoid F coil and circuit for an open or resistance outside the manufacturer's specification.
- If the wiring and coil test correctly, check the control module output and related connections before condemning the module.
Common fixes
- Repair the solenoid F control wire if it is shorted to battery voltage.
- Repair loose, corroded, or damaged terminals at the solenoid F connector.
- Replace shift solenoid F if its coil is open or outside specification.
- Repair an open or damaged section of the solenoid F circuit harness.
- Repair or replace the control module if testing confirms its output is causing the high circuit reading.
Can I keep driving?
Limit driving if shifts are harsh, delayed, slipping, or the vehicle is stuck in one gear; arrange a tow if it cannot shift predictably. Continued slipping or incorrect shifts can overheat or 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.