Shift solenoid or pressure control solenoid for element F sticking or failing to release; Contaminated, degraded or incorrect level of transmission fluid; Valve body wear, sticking valves or debris blocking hydraulic passages; Wiring or connector fault between the solenoid and the control module; Worn, burnt or mechanically seized clutch or brake pack; Faulty input, output or turbine speed sensor giving false slip readings; Outdated transmission control software where a manufacturer update is known to address the fault.

P07AD

Transmission Friction Element F Stuck On.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
AD: FaultThe specific fault in that area

What it means

P07AD means the transmission control module has detected that friction element F (a clutch or brake pack inside the automatic gearbox) is staying applied when it should be released. It sets when the measured input/output speed ratio or slip pattern shows the element is still holding, or is engaged in a gear where it should be off. Which physical clutch or brake is 'F' depends on the gearbox, so the exact layout varies by manufacturer and model.

Symptoms

Gearbox warning light or malfunction indicator lamp on
Gearbox going into limp mode, often fixed in one gear
Harsh, flared or delayed shifts
Engine braking, shudder or feeling of the car being held back
Car stalling or struggling when stopping or selecting drive or reverse
Poor acceleration or reduced fuel economy

Possible causes

Shift solenoid or pressure control solenoid for element F sticking or failing to releaselikely
Contaminated, degraded or incorrect level of transmission fluidlikely
Valve body wear, sticking valves or debris blocking hydraulic passagespossible
Wiring or connector fault between the solenoid and the control modulepossible
Worn, burnt or mechanically seized clutch or brake packpossible
Faulty input, output or turbine speed sensor giving false slip readingspossible
Outdated transmission control software where a manufacturer update is known to address the faultrare

How to diagnose

Read all stored codes and freeze frame data, noting gear, speeds, fluid temperature and when the fault set; look for related solenoid, speed sensor or ratio codes
Check transmission fluid level, condition and smell against the manufacturer's procedure, as many gearboxes need a set temperature and method
Inspect the gearbox wiring, connector and harness for damage, chafing, oil ingress or corrosion
Check the battery and charging voltage, as low voltage can cause false transmission faults
Use live data to compare input, output and turbine speeds and the commanded versus actual gear and solenoid status
Test the solenoid circuit and solenoid resistance against the manufacturer's specification
Check for any applicable technical service bulletins or software updates for the model and gearbox
If the electrical side is sound, carry out hydraulic pressure tests or a pan and valve body inspection as the model's procedure allows

How to fix

Correct the fluid level or replace the fluid and filter with the specified type if contaminated or degraded
Replace the faulty solenoid or speed sensor once testing confirms it
Repair or replace damaged wiring and connectors
Clean, repair or replace the valve body if sticking or debris is found
Overhaul or replace the gearbox if the clutch or brake pack is burnt or seized
Apply a manufacturer software update only if a known fault in the existing calibration is confirmed

Can I keep driving?

High severity

Avoid driving beyond what is needed to reach a garage, as a clutch element staying applied can overheat and quickly damage the gearbox. If the car is in limp mode or feels held back, stop driving and arrange recovery.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.