Powertrain, generic · Transmission

P07AD Transmission Friction Element F Stuck On

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. No manufacturer document available to us uses this code; the documented hybrids have at most five monitored clutches. The description follows the family: when clutch F should release, slip stays below the expected profile. A clutch that does not release ties up the transmission, causing jolts or stalling. Slip of the same clutch is P079F.

Likely causes

Clutch F stuck, welded or piston hanging
Valve or spool sticking in the applied position
Contaminated fluid (debris)
Module software

Symptoms

  • Check engine light or 'service hybrid system' message
  • Jolt or tie-up on mode or gear changes
  • Engine stalls or drags when stopping
  • Limp mode with reduced power

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

P07ACP079FP2705

References: law.cornell.edu, patents.google.com, gsi.ext.gm.com.