OBD Codes List

Diagnostic reference · P07AC

P07AC

Transmission Friction Element F Performance/Stuck Off

System
Transmission (P code)
Lamp
Check Engine Light
Category
Powertrain - Transmission

What it means

P07AC means Transmission Friction Element F Performance/Stuck Off.

Check these first

  • A friction element F that will not apply
  • A solenoid or valve body fault holding element F off
  • A failed transmission fluid pump
  • Low or degraded transmission fluid
  • A TCM calibration fault

What to do next

  1. Read friction element F apply data on a scan tool
  2. Command the element F apply and watch slip
  3. Check the fluid level and condition
  4. Test the solenoid and valve body on element F
  5. Repair the element F circuit if it will not apply
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.