Diagnostic article Generic OBD-II
P07D7: eighth gear cannot be confirmed released
P07D7 identifies eighth gear stuck during repeated disengagement attempts in this transmission monitor.
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Documented application
2025 GM 25OBDG07A Part2 diagnostic monitor documentation; the application-matrix filename mismatch is unresolved, so no model or engine applicability 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.
P07D7 identifies eighth gear stuck during repeated disengagement attempts in this transmission monitor. The controller expects movement toward neutral and checks whether the disengagement sequence can progress.
Position faults can contribute
The cited row names shift-fork position sensor 5. An electrical or consistency fault on that channel during actuation can cause an attempt to fail. An alternative path is failure to satisfy the next disengagement-state transition before its calibrated timeout.
Eighth-gear disengagement must be requested and active, pressure must exceed 4.5 bar, and error or bypass application states must be absent. The fault confirms after at least four unsuccessful disengagement attempts.
Release performance is the diagnostic subject
Successful engagement of eighth gear does not prove it can later disengage correctly. The stored result specifically concerns release, and a position-sensor problem can prevent reliable confirmation even when the mechanical situation has not been independently established.
Retain the requested neutral target, sensor-5 status, timeout state, and attempt history for the applicable professional diagnosis. Verification should demonstrate a correctly confirmed release through the proper service sequence. The table delegates exact state timeouts to attachments and does not justify inventing a universal delay, forcing more shifts, or selecting a gearbox component for replacement from this code alone.
Documentation and applicability
These details describe the monitor in GM’s 2025 25OBDG07A Part2 file. Its application-matrix filename does not match the download index, so model and engine applicability remain unresolved. Use the vehicle’s correct service information before applying these calibration details.
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
Stuck in Gear 8
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