Diagnostic article Generic OBD-II
P2764: TCC circuit low needs confirmation beyond the initial driver indication
Understand how P2764 distinguishes a persistent ground fault from preliminary low-circuit evidence.
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Documented application
2025 GM 25OBDG06C documented monitor only. Vehicle, engine and calibration applicability must be confirmed from the matching service information; no model fitment 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.
P2764 is the ground-fault classification for the torque-converter clutch pressure-control solenoid circuit. GM describes an initial driver-level low indication followed by a more specific controller-run test. That sequence helps explain why an early pending fault is not yet equivalent to a completed ground-short diagnosis.
Follow the two-stage decision
A single hardware detection can establish pending status. After at least three samples of the initial condition, the controller changes its low-side-driver state for an intrusive diagnostic check. A short-to-ground indication persisting for at least three further test samples produces the malfunction result.
The row lists 20 ms checking frequency and a 120 ms time requirement. These are internal diagnostic actions and timings, not instructions to disconnect a circuit or simulate a short manually.
Distinguish the shared starting symptom
P2761’s open-circuit monitor can begin from a similar low hardware indication. The subsequent classification is what separates an open result from P2764. Treating any low reading as definitive proof of a ground path would skip that distinction.
Supply voltage, high-side-driver enablement, relevant companion faults and cranking restrictions govern eligibility. Preserve those states with the final subtype and its pending/confirmed status. A later normal driving response cannot reconstruct the original electrical event. The source does not locate a short or identify a failed solenoid; the applicable circuit procedure must determine where the electrical behavior originates.
Source and applicability
2025 GM 25OBDG06C documented monitor only. Vehicle, engine and calibration applicability must be confirmed from the matching service information; no model fitment is inferred. These criteria explain controller logic, not a complete repair procedure. 25OBDG06C, PDF page 1306. 25OBDG06C, PDF page 1309.
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 Low
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.
Separately researched
Vehicle-specific diagnosis
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Definition source
- DTC Database: pinned community code definitions
Source checked · MIT