What it means
The transmission control module monitors pressure control solenoid F and the hydraulic pressure it regulates. This code sets when the module detects a fault associated with solenoid F, though the title does not specify whether the fault is electrical or hydraulic.
At a glance
- Usually lights the check-engine light
How it works
Pressure control solenoid F is an electrically operated valve that helps the transmission control module regulate fluid pressure. P2731 identifies a fault associated with solenoid F, but does not specify whether the cause is electrical or hydraulic, so diagnosis should compare the module's command with the solenoid circuit and transmission response.
Common causes
Most likely first.
- Aged solenoid coil resistance drift
- Worn valve body bore around the solenoid
Symptoms
- Check-engine or transmission warning light on
- Harsh or delayed shifts
- Slipping or shuddering during shifts
- Transmission may enter limp mode
How to diagnose it
- Record freeze-frame data and all transmission codes, then use live data to compare commanded solenoid F operation with available pressure or gear-response information.
- Inspect the solenoid F connector and wiring for loose terminals, corrosion, heat damage, or a damaged harness.
- Check solenoid F coil resistance and circuit continuity against the manufacturer's specification.
- If electrical checks pass, compare the transmission's pressure or shift response with solenoid F commands using the manufacturer's diagnostic procedure.
- If the circuit responds correctly but pressure response is poor, inspect solenoid F and its valve-body bore for sticking or wear.
Common fixes
- Repair damaged wiring or poor connections in the solenoid F circuit.
- Replace solenoid F if its coil resistance has drifted outside the manufacturer's specification.
- Clean or replace a sticking solenoid F valve if inspection confirms contamination or restricted movement.
- Repair a worn valve-body bore if it prevents solenoid F from regulating pressure.
Can I keep driving?
Drive gently and avoid towing or hard acceleration, since pressure-control problems can cause harsh shifts or slipping. Stop if the transmission loses drive, slips repeatedly, or enters limp mode.
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.