P07A4Transmission Friction Element B Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Each friction element (clutch or brake) has three functional codes: slip while commanded locked (P079A ff), performance/stuck off – it does not apply or applies too weakly – and stuck on – it does not release. P07A4 concerns clutch B. Only Ford's DPS6 PowerShift dry dual-clutch uses it, for clutch B – input shaft 2 with reverse and gears 2, 4 and 6 – as 'functionally stuck off', next to the electrical codes of the clutch B actuator; Ford publishes no thresholds. GM's hybrids report clutch 2 only as slip (P079B) or stuck on (P07A5). A clutch that does not apply means missing even gears or reverse and limp mode.
- What you may notice
- Check engine light or transmission warning
- Gear missing or slipping, weak acceleration
- Limp mode
- Likely causes
- LikelyClutch B plates worn or piston seal leaking
- PossibleToo little apply pressure (fluid, pump, valve)
- PossibleClutch actuator or valve sticking (DCT: electric actuator)
- RareModule software or lost adaption
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €200 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.