MechanicDB
Fault Family System: Powertrain (P-Codes) 38 SAE Codes

Transmission Friction Element Performance

Diagnostic & Technical Explanation
Code P079A (Transmission Friction Element A Slip Detected) sets when the TCM's shaft-speed cross-check detects a specific internal friction element (clutch pack or band, identified by letter) slipping during apply, or stuck applied/released when it should not be. Causes are low or contaminated transmission fluid reducing clamping pressure, a worn friction element, a sticking valve-body spool feeding that element, or a failed pressure/shift solenoid controlling it.

These 38 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 38 times.

Codes in this family (38)

CodeDefinitionRepair coverage
P079ATransmission Friction Element A Slip Detected4 ranked fixes
P079BTransmission Friction Element B Slip Detected4 ranked fixes
P079CTransmission Friction Element C Slip Detected4 ranked fixes
P079DTransmission Friction Element D Slip Detected4 ranked fixes
P079ETransmission Friction Element E Slip Detected4 ranked fixes
P079FTransmission Friction Element F Slip Detected4 ranked fixes
P07A0Transmission Friction Element G Slip Detected4 ranked fixes
P07A1Transmission Friction Element H Slip Detected4 ranked fixes
P07A2Transmission Friction Element A Performance/Stuck Off4 ranked fixes
P07A3Transmission Friction Element A Stuck On4 ranked fixes
P07A4Transmission Friction Element B Performance/Stuck Off4 ranked fixes
P07A5Transmission Friction Element B Stuck On4 ranked fixes
P07A6Transmission Friction Element C Performance/Stuck Off4 ranked fixes
P07A7Transmission Friction Element C Stuck On4 ranked fixes
P07A8Transmission Friction Element D Performance/Stuck Off4 ranked fixes
P07A9Transmission Friction Element D Stuck On4 ranked fixes
P07AATransmission Friction Element E Performance/Stuck Off4 ranked fixes
P07ABTransmission Friction Element E Stuck On4 ranked fixes
P07ACTransmission Friction Element F Performance/Stuck Off4 ranked fixes
P07ADTransmission Friction Element F Stuck On4 ranked fixes
P07AETransmission Friction Element G Performance/Stuck Off4 ranked fixes
P07AFTransmission Friction Element G Stuck On4 ranked fixes
P07B0Transmission Friction Element H Performance/Stuck Off4 ranked fixes
P07B1Transmission Friction Element H Stuck On4 ranked fixes
P2700Transmission Friction Element A Apply Time Range/Performance4 ranked fixes
P2701Transmission Friction Element B Apply Time Range/Performance4 ranked fixes
P2702Transmission Friction Element C Apply Time Range/Performance4 ranked fixes
P2703Transmission Friction Element D Apply Time Range/Performance4 ranked fixes
P2704Transmission Friction Element E Apply Time Range/Performance4 ranked fixes
P2705Transmission Friction Element F Apply Time Range/Performance4 ranked fixes
P270ATransmission Friction Element A Temperature Too High4 ranked fixes
P270BTransmission Friction Element B Temperature Too High4 ranked fixes
P270CTransmission Friction Element C Temperature Too High4 ranked fixes
P270DTransmission Friction Element D Temperature Too High4 ranked fixes
P270ETransmission Friction Element E Temperature Too High4 ranked fixes
P270FTransmission Friction Element F Temperature Too High4 ranked fixes
P273ATransmission Friction Element G Apply Time Range/Performance4 ranked fixes
P273BTransmission Friction Element H Apply Time Range/Performance4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here: