What it means
The transmission control module monitors the electrical circuit for pressure control solenoid F. This code sets when the circuit has an electrical fault; the title does not specify whether it is an open or a short.
At a glance
- Usually lights the check-engine light
How it works
Pressure control solenoid F is an electrically controlled valve that helps regulate transmission hydraulic pressure. The TCM monitors its circuit and sets P2734 when it detects an electrical fault, without identifying whether the circuit is open or shorted.
Common causes
Most likely first.
- Open solenoid coil
- Short to ground or battery in the harness
Symptoms
- Check-engine or transmission warning light on
- Harsh or delayed shifts
- Slipping or reduced drive
- Transmission may enter limp mode
How to diagnose it
- Record freeze-frame data and scan for related transmission codes to see when the solenoid F circuit fault occurred and whether it recurs.
- Inspect the transmission fluid level and condition according to the vehicle maker's procedure, and note any shift symptoms.
- Inspect the solenoid F connector and harness for loose pins, corrosion, fluid entry, chafing, or damage.
- Use the wiring diagram to check solenoid F circuit continuity and for shorts to ground or power.
- Measure solenoid F coil resistance and compare it with the manufacturer's specification to identify an open or failed coil.
- If the coil and harness pass, check the TCM connector and output circuit for an electrical fault.
Common fixes
- Reconnect or clean the solenoid F electrical connector and repair damaged terminals.
- Repair an open or shorted section of the solenoid F harness.
- Replace solenoid F if its coil is open or outside the manufacturer's specification.
- Repair the TCM circuit if testing confirms a fault at the module.
Can I keep driving?
If the transmission still drives normally, limit driving and avoid heavy loads until the circuit is checked. Stop if it slips, loses drive, or shifts unpredictably, since continued use can 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.