Diagnostic article Generic OBD-II
P2758: Converter-clutch stuck-on evidence requires an off command
Understand Ford P2758 low-slip monitoring and why normal lockup under an on command does not reproduce the fault.
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Documented application
Ford 2024–2025 gasoline OBD operation summary, July 16 2024 revision; only the cited monitor and transmission architectures. No individual vehicle fitment or universal calibration is inferred.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P2758 is Ford's functionally stuck-on torque-converter clutch result. The key contradiction is low slip while the clutch is commanded off. Low slip during a legitimate lockup command is not the condition described by this monitor.
Compare slip with command and torque
The cited gasoline summary gives a typical stuck-on event when converter slip is below 20 rpm with the converter commanded off and input torque above 60 Nm. It also states that the condition must occur in multiple gears before the code is set. A single low-slip snapshot without those conditions is incomplete evidence.
Electrical converter-clutch diagnostics run separately. Their command-versus-driver-feedback check does not directly establish the mechanical release behavior represented by P2758/P0740_7E.
Record a release failure rather than assuming one
A useful capture includes clutch command, input torque, relevant speeds and the gear in which the observation occurred. If command remains on, that does not reproduce the off-command contradiction. If speed information is unreliable, the slip conclusion needs verification before a mechanical cause is assigned.
The summary does not prove that the converter itself, a particular solenoid or a hydraulic valve is defective. It also does not provide a universal road-test maneuver. The matching transmission procedure must confirm the failed release behavior and isolate its cause using the documented operating context.
Source and applicability
Ford 2024–2025 gasoline OBD operation summary, July 16 2024 revision; only the cited monitor and transmission architectures. No individual vehicle fitment or universal calibration is inferred. Ford PDF, page 153. Ford PDF, page 155.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT