P079A
Transmission Friction Element A Slip Detected
Friction element A (the first clutch or band in the gear matrix) shows measurable slip while it should be fully engaged. Detected by comparing input/output speed sensors against the commanded gear ratio. Slip means the element cannot transmit full torque — risk of glazing the friction surfaces.
Friction element A (the first clutch or band in the gear matrix) shows measurable slip while it should be fully engaged. Detected by comparing input/output speed sensors against the commanded gear ratio. Slip means the element cannot transmit full torque — risk of glazing the friction surfaces.
Common causes
- high
Worn friction discs in element A
One of the most commonly reported causes for this code — check this first.
Typical part cost: $660-4400
- medium
Low hydraulic pressure to element A
A plausible cause — test and verify before replacing parts.
Typical part cost: $660-4400
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P079A.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P079A.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P079A.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P079A mean?
P079A means "Transmission Friction Element A Slip Detected". It is a generic OBD-II code that points to a fault in the transmission.
What are the most common causes of P079A?
worn friction discs in element a; low hydraulic pressure to element a; old atf lacking friction modifier — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P079A diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.