Powertrain, generic · Transmission

P07A4 Transmission Friction Element B Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

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

Symptoms

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

Repair estimate

DifficultyHardWorkshop job
Parts and labour€200–4,500
Time1–12 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission clutchestransmission valve bodyhybrid control module

Related codes

P07A5P079BP090AP087AP2701

References: newtonnet.co.uk, law.cornell.edu, patents.google.com.