P079F
Transmission Friction Element F Slip Detected
Transmission / internal
Generic OBD-II
High
What it means
P079F means the transmission control module detected internal friction element "F" — a clutch pack or band — slipping instead of holding firmly. Slipping generates heat and rapidly wears the friction material, so it's a serious code. It often starts with low or worn-out fluid or a solenoid that isn't delivering enough apply pressure, but it can also mean the element itself is worn.
High
Can I keep driving? Limit driving — a slipping clutch pack overheats and accelerates internal wear, so get it diagnosed before it fails completely.
Common symptoms
What you'll notice
- Slipping or jerking sensation when changing gears
- Delayed or harsh shifts
- Transmission overheating
- Reduced fuel economy
- Check-engine light on
Common causes
Most likely first
- Low or degraded transmission fluidLikely
- Worn friction element / clutch platesCommon
- Faulty shift or pressure-control solenoid reducing apply pressureCommon
- Stuck or worn valve bodyLess often
- Internal mechanical wear in the transmissionLess often
How to diagnose & fix
Work through it in order
- Check transmission fluid level and condition; flush and refill if low, dirty, or burnt.
- Replace the transmission filter if clogged or contaminated.
- Inspect and adjust the bands for proper tension where applicable.
- Verify apply pressure and test the relevant solenoids.
- Inspect and replace the worn friction element / clutch plates if hydraulics are good.
FAQ
Quick answers
Is it safe to drive with P079F?+
Not really. A slipping friction element overheats the transmission and worsens with use, so keep driving to a minimum until it's diagnosed.
Can I just clear P079F?+
Clearing won't stop the slip — the code returns as soon as the element slips again, and driving on it risks further internal damage.
Related codes
Often seen with P079F
Read & clear P079F yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX