Low or degraded transmission fluid, or wrong fluid type, reducing clutch apply pressure; Worn or burnt friction plates in the clutch or brake pack for element D; Faulty shift or pressure control solenoid for element D, sticking or electrically failed; Valve body wear, sticking valves or blocked fluid passages causing low apply pressure; Damaged wiring, connectors or poor earth/power supply to the transmission solenoids; Internal seal leak or piston damage in the clutch pack, or a blocked filter starving the pump; Faulty speed sensor giving incorrect ratio readings, or outdated transmission control software.

P07A8

Transmission Friction Element D 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
A8: FaultThe specific fault in that area

What it means

P07A8 means the transmission control module has detected that friction element D (a clutch or brake pack inside the automatic gearbox) is not engaging when commanded, so it is stuck off or performing poorly. The control unit sets it when the measured gear ratio or input/output speed difference does not match the expected ratio while that element should be applied. Which gears use element D, and how it is labelled, depends on the gearbox model.

Symptoms

Transmission slipping or engine revving without matching acceleration in certain gears
Harsh, delayed or flared gear changes
Gearbox stuck in a limp-home gear
Loss of one or more gears, or no drive or reverse
Gearbox warning light or malfunction indicator lamp on
Poor acceleration or higher fuel consumption

Possible causes

Low or degraded transmission fluid, or wrong fluid type, reducing clutch apply pressurelikely
Worn or burnt friction plates in the clutch or brake pack for element Dlikely
Faulty shift or pressure control solenoid for element D, sticking or electrically failedpossible
Valve body wear, sticking valves or blocked fluid passages causing low apply pressurepossible
Damaged wiring, connectors or poor earth/power supply to the transmission solenoidspossible
Internal seal leak or piston damage in the clutch pack, or a blocked filter starving the pumppossible
Faulty speed sensor giving incorrect ratio readings, or outdated transmission control softwarerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting gear, temperature, speed and load when the fault set
Check transmission fluid level, condition and smell using the correct procedure for the model, as some gearboxes are sealed or need a set temperature
Inspect the transmission wiring harness, connector and any external leaks for damage, corrosion or contamination
Check battery condition and charging voltage, as low voltage can upset solenoid operation
Use live data to compare input and output speeds, gear ratio, slip values and commanded versus actual solenoid current or pressure
Test the element D solenoid circuit and resistance against the manufacturer specification, and check the speed sensor signals
Perform a line pressure test or adaptation and clutch volume checks where the model allows
Check for any applicable software updates or technical bulletins for the gearbox, then inspect the pan, filter and debris for clutch material

How to fix

Correct the fluid level or replace degraded fluid and filter with the specified type
Repair or replace damaged wiring, connectors or poor earths in the transmission circuit
Replace the faulty solenoid or solenoid pack for element D
Repair or replace the valve body or worn seals as indicated by pressure testing
Overhaul or replace the transmission if the friction element or internal components are worn or burnt
Update the transmission control software only if a known fault is fixed by the update

Can I keep driving?

High severity

Avoid driving beyond what is necessary, as continued slipping can quickly burn the clutch pack and cause costly internal damage. If the gearbox is in limp mode or slipping, stop and have the vehicle recovered or inspected before further use.

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