What it means
The transmission control module detected a performance problem with friction element C or that it did not engage as expected. The code alone does not identify the cause.
At a glance
- Usually lights the check-engine light
How it works
The transmission control module checks whether friction element C engages as commanded by comparing the expected and actual transmission ratio. P07A6 indicates poor performance or an apparent failure of element C to apply; a leaking seal, restricted movement, or worn parts may prevent it from holding.
Common causes
Most likely first.
- Leaking apply seal
- Carbon or debris buildup preventing free movement
- Component wear with age - mechanical play
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Save freeze-frame data and check live commanded gear and input/output speeds to find when element C failed to produce the expected ratio.
- Check fluid level and condition using the maker’s procedure, since low or degraded fluid can prevent element C from receiving enough apply pressure.
- Inspect transmission wiring and connectors for damage, corrosion, or looseness that could interrupt element C control.
- Use a controlled road test to identify whether shifts involving element C are delayed, missing, or accompanied by slipping or shudder.
- If fluid and wiring checks are inconclusive, test hydraulic pressure and valve-body operation against the manufacturer's specification.
- If pressure control is satisfactory, inspect element C’s apply seal and internal friction parts for leakage, debris, or wear.
Common fixes
- Restore the specified fluid level or replace degraded fluid with the correct type.
- Repair damaged wiring or clean and secure connectors.
- Repair a valve-body or hydraulic pressure fault affecting element C.
- Replace a leaking apply seal or worn element C friction parts, and clear any restriction found in its passages.
Can I keep driving?
Avoid heavy loads, towing, and extended trips while element C is failing to engage, because continued slipping can overheat the transmission and worsen internal wear. If shifts are missing or the vehicle enters limp mode, stop safely and arrange recovery.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.