Diagnostic article Generic OBD-II
P2776: Upshift input low needs a calibration check before applying the number
P2776’s electrical-low row overlaps another printed paddle window, so the voltage specification must be resolved for the vehicle.
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Documented application
2025 GM 25OBDG07A Part 2 documented monitor only; its application-matrix filename join is unresolved. No model, engine or universal calibration 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.
The P2776 electrical monitor checks the upshift-paddle analog input against a lower working limit. Its row prints 2,519 mV with 30 mV hysteresis and a 150 ms confirmation period. However, the same document elsewhere lists a pressed-state window beginning at 2,200 mV. That overlap is retained as a source-review issue, not silently repaired.
What remains useful
The supported distinction is between an electrical-low classification and a logical plausibility fault. P2776 evaluates the input voltage directly; the separate P2775 monitor asks whether the value fits a valid pressed or released state after electrical faults are excluded.
The low check requires suitable controller battery voltage, no cranking and a non-stop key state. P0882 and P0883 disable it, so a supply fault can affect whether a verification attempt is eligible.
Do not turn the conflict into a repair instruction
Record the input, supply status and exact calibration. Resolve the applicable voltage boundaries in current vehicle service information before judging a measured value near the disputed region. The summary does not justify replacing the paddle from its generic title, nor does it prove whether a switch or another circuit element pulled the input low.
Document scope and source
2025 GM 25OBDG07A Part 2 documented monitor only; its application-matrix filename join is unresolved. No model, engine or universal calibration applicability is inferred. These figures explain the cited controller logic, not a vehicle-specific repair instruction. Match the vehicle’s service information before applying them.
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
Upshift Switch 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.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT