P07A4: Transmission Friction Element B Performance/Stuck Off

What does P07A4 mean?

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.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine light or transmission warning
• Gear missing or slipping, weak acceleration
• Limp mode

Common causes

• High Clutch B plates worn or piston seal leaking
• Medium Too little apply pressure (fluid, pump, valve)
• Medium Clutch actuator or valve sticking (DCT: electric actuator)
• Low Module software or lost adaption

Likelihood is a general estimate across vehicles; your make and model may differ.