What it means
The control module detects an intermittent fault in the transmission fluid pressure sensor/switch F circuit.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Transmission pressure sensor/switch F reports hydraulic pressure information to the control module, which uses it to check transmission operation. This code sets when the module detects an intermittent electrical fault in sensor/switch F's circuit, so the signal may cut in and out rather than stay consistently wrong.
Common causes
Most likely first.
- Connector not seated
- Harness chafing intermittently
- Connector with intermittent contact under vibration
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 the freeze-frame data and check transmission live data for pressure-signal dropouts, especially around the time the fault occurred.
- Inspect sensor/switch F's connector for a loose fit, damaged latch, moisture, corrosion, or pins that do not grip securely.
- Follow the sensor/switch F harness and look for chafing, stretched sections, heat damage, or places where vibration could pull the wiring.
- With the wiring diagram and manufacturer's procedure, monitor the circuit while gently moving the harness and connector to reproduce an intermittent open or poor contact.
- If the wiring and connections remain sound, test sensor/switch F and its circuit against the manufacturer's specifications before considering a control-module fault.
Common fixes
- Reseat and secure the sensor/switch F connector.
- Repair chafed or damaged wiring in the sensor/switch F circuit.
- Clean or repair loose, corroded, or damaged connector terminals.
- Replace sensor/switch F if testing confirms it is intermittent.
- Repair or replace the control module only if circuit and sensor tests identify it as the cause.
Can I keep driving?
Avoid towing, hard acceleration, and unnecessary trips if shifts are erratic or the transmission enters limp mode. A pressure signal that drops out can lead to poor shifting or slipping, which may worsen transmission damage.
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.