Sticking or faulty shift solenoid or pressure control solenoid feeding element G, leaving it applied; Valve body wear, sticking valves or internal hydraulic leaks keeping element G pressurised; Low, degraded or contaminated gearbox fluid, or a blocked filter or passages; Damaged wiring, connector or water ingress affecting solenoid circuits or speed sensor signals; Faulty input or output speed sensor giving misleading slip readings; Mechanically burnt, seized or failed clutch or brake pack; Outdated transmission control unit software where the manufacturer has issued a known fix.

P07AF

Transmission Friction Element G 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
AF: FaultThe specific fault in that area

What it means

P07AF is a generic powertrain code meaning the transmission control unit has detected that friction element G, a clutch or brake pack inside the automatic gearbox, is stuck on (engaged) when it should be released. The control unit sets it when the measured speed ratios or slip across the gearbox do not match the gear commanded, or when it sees signs of a binding or tied-up gearbox. Which physical clutch or brake is 'element G' depends on the manufacturer and gearbox, so the exact component must be confirmed from model-specific information.

Symptoms

Gearbox warning light or malfunction indicator lamp on
Gearbox goes into limp-home mode, often fixed in one gear
Harsh, flared or delayed shifts
Engine feels held back or stalls when stopping in gear
Reduced acceleration or poor performance
Burning smell or overheated gearbox fluid

Possible causes

Sticking or faulty shift solenoid or pressure control solenoid feeding element G, leaving it appliedlikely
Valve body wear, sticking valves or internal hydraulic leaks keeping element G pressurisedlikely
Low, degraded or contaminated gearbox fluid, or a blocked filter or passagespossible
Damaged wiring, connector or water ingress affecting solenoid circuits or speed sensor signalspossible
Faulty input or output speed sensor giving misleading slip readingspossible
Mechanically burnt, seized or failed clutch or brake packpossible
Outdated transmission control unit software where the manufacturer has issued a known fixrare

How to diagnose

Read all stored codes and freeze frame data, noting gear commanded, gearbox temperature, speeds and load when the fault set
Check for related solenoid, speed sensor or gear ratio codes and for any manufacturer bulletins for the model and gearbox
Check gearbox fluid level, condition and smell using the correct procedure for the model, looking for burnt fluid or debris
Inspect gearbox wiring, connectors and the internal harness plug for damage, corrosion, fluid contamination or poor pins
Check live data for input and output speed, gear ratio and slip in each gear against the commanded gear
Test the solenoid circuits and resistance and compare with specification, and check speed sensor signals
Carry out a stall or pressure test only if the manufacturer procedure allows, to check hydraulic pressures
Confirm which component is element G from model-specific information before opening the gearbox

How to fix

Repair or replace damaged wiring, connectors or the internal harness
Replace faulty solenoids or speed sensors confirmed by testing
Service the gearbox with the correct fluid and filter, and clean or replace the valve body if worn or sticking
Repair or overhaul the gearbox, replacing the failed clutch or brake pack and related components
Update the transmission control software only if a known fault fix applies to that vehicle

Can I keep driving?

High severity

Avoid driving beyond what is needed to get the car to a workshop, as a stuck-on friction element can overheat and quickly damage the gearbox. If the car is in limp mode, stalls, or smells of burning, stop and arrange recovery.

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