Low, degraded or contaminated transmission fluid reducing clutch apply pressure; Worn friction plates in element G causing slip; Faulty shift or pressure control solenoid, or sticking valve body valve feeding element G; Internal hydraulic leak, such as worn seals or sealing rings on the clutch piston or shaft; Wiring or connector fault between the transmission control module and the solenoids, or a poor internal harness connection; Faulty speed sensor giving incorrect shaft speed readings; Fault or outdated software in the transmission control module.

P07AE

Transmission Friction Element G Performance/Stuck Off.

Generic
Powertrain
Generic code
High severity

How this code is built

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

What it means

P07AE is a generic powertrain code meaning the transmission control module has detected that friction element G (a clutch or brake pack inside the automatic gearbox) is not engaging as commanded, or is stuck off. The control unit compares input and output shaft speeds against the expected gear ratio and sees slip or flare when element G should be applied. Which clutch or brake 'G' refers to, and in which gears it is used, depends on the gearbox model.

Symptoms

Engine revs flare or rise without matching acceleration during certain gear changes
Harsh, delayed or slipping shifts
Transmission stuck in a single gear or in limp-home mode
Gearbox warning light or malfunction indicator lamp on
Loss of one or more gears, or no drive in some ratios
Burnt smell from the transmission fluid

Possible causes

Low, degraded or contaminated transmission fluid reducing clutch apply pressurelikely
Worn friction plates in element G causing sliplikely
Faulty shift or pressure control solenoid, or sticking valve body valve feeding element Glikely
Internal hydraulic leak, such as worn seals or sealing rings on the clutch piston or shaftpossible
Wiring or connector fault between the transmission control module and the solenoids, or a poor internal harness connectionpossible
Faulty speed sensor giving incorrect shaft speed readingspossible
Fault or outdated software in the transmission control modulerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting gear, temperature, load and speed when the fault set
Check for related codes such as other friction element, solenoid, speed sensor or gear ratio codes, and check for any manufacturer service information or bulletins for the model
Check the transmission fluid level and condition (colour, smell, debris) following the manufacturer's procedure for that gearbox
Inspect the external wiring, connectors and any transmission harness plug for damage, corrosion, or fluid ingress
Use live data to compare input and output shaft speeds and commanded gear against actual ratio, watching for slip when element G is applied
Test the relevant solenoid's resistance and electrical operation against the specification for that gearbox
Carry out a line pressure test or the manufacturer's clutch adaptation and diagnostic tests where available
Drop the pan or open the valve body to look for metal or friction material, and assess whether internal repair is needed

How to fix

Correct the fluid level or replace degraded fluid and filter using the specified type and procedure
Repair or replace damaged wiring, connectors or the internal harness
Replace the faulty solenoid or speed sensor once testing confirms it
Clean, repair or replace the valve body if valves are sticking or worn
Overhaul the gearbox, replacing worn friction plates and seals for element G
Update or reflash the transmission control software only if the manufacturer lists a calibration fix for this fault

Can I keep driving?

High severity

Limit driving and avoid it if the gearbox is slipping, flaring or in limp mode, as continued slip quickly burns clutches and can turn a minor repair into a gearbox rebuild. If it must be moved, keep it gentle and short, then get it diagnosed promptly.

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