P2125: APP2 is out of range on the secondary processor only

P2125 is described as accelerator-pedal sensor 2 in the cited GM table, despite the broader generic sensor-E circuit title. The monitor specifically identifies a secondary-processor APP2 reading outside range while the primary-processor evaluation of that sensor remains in range.

Keep both processor views in the diagnosis

The documented secondary limits are below 0.325 V or above 4.75 V. The row also excludes the listed five-volt-reference faults and applies supply and reduced-power qualifications. That context is necessary before treating the stored code as a simple pedal-voltage failure.

Nearby APP2 low/high rows use different combinations of primary and secondary evaluations. A displayed pedal value from one scan parameter may therefore omit the discrepancy that P2125 records. The correct vehicle data definitions determine which information is available.

Do not assign hardware from the generic letter

The source does not establish that a universally located fifth sensor or a particular connector pin is involved. Its APP2 naming and processor split must be mapped through the actual vehicle's wiring and diagnostic information.

Retain the original code, supply/reference state and any available paired readings. The table does not prove whether the cause is in the pedal, wiring or controller evaluation. Its counter notation also does not supply a universal external test duration. Professional electronic-throttle diagnosis must isolate the cause and verify the relevant processor path under the matching vehicle procedure.

Source and applicability

GM 2009 09OBDG07 Engine Diagnostics, cited secondary-processor APP2 range monitor only. Individual vehicle, engine, wiring and calibration applicability has not been established from this parameter file.

General Motors source, physical page 108