P079C
Transmission Friction Element C Slip Detected
Transmission / internal (clutch)
Generic OBD-II
High
What it means
P079C means the transmission control module detected friction element "C" — one of the internal clutch packs or bands — slipping instead of holding its gear solidly. Slip is one of the more damaging conditions a transmission can report: it generates heat and wears the clutch material fast, so it should be addressed quickly rather than driven on.
High
Can I keep driving? Drive as little as possible — a slipping friction element builds heat and wears fast, and extended driving can ruin the transmission. Get it checked promptly.
Common symptoms
What you'll notice
- Slipping or jerking when shifting gears
- Delayed or erratic shifting
- Transmission running hot
- Higher-than-expected engine RPM for the gear
- Check-engine light on
Common causes
Most likely first
- Low transmission fluid levelLikely
- Worn or damaged friction element (clutch pack) CCommon
- Faulty solenoid or valve not applying the element with enough pressureCommon
- Wiring or sensor faults feeding bad data to the moduleLess often
- Internal mechanical wear or damage in the transmissionLess often
How to diagnose & fix
Work through it in order
- Check transmission fluid level and condition first; if low or dirty, service it with the specified fluid.
- Inspect the pan and filter for clutch material or metal debris, and replace a clogged filter.
- Verify apply pressure and test the solenoids/valve body controlling friction element C.
- Check and adjust transmission bands for proper tension where applicable.
- If pressures are correct, the friction element/clutch plates are worn and the transmission needs teardown or overhaul. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P079C?+
Not for long. A slipping clutch pack overheats and wears quickly, so keep driving to a minimum and get it diagnosed before the damage spreads.
Can I just clear P079C?+
You can, but it returns as soon as the element slips again. Clearing it without fixing the fluid, pressure, or worn clutch just hides worsening damage.
Related codes
Read & clear P079C 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