P04C6: high lock-position feedback can represent an open circuit

P04C6 in the cited GM hybrid diagnostic table is the high branch for fuel-fill door lock-position feedback. The strategy explicitly allows a short-to-battery condition or an open circuit. A high reading therefore does not uniquely establish that the signal wire is touching battery power.

Do not equate high with locked

The threshold concerns an electrically invalid reported position. It is not simply the normal indication that the latch is locked. A visual check of the lock cannot replace evaluation of the feedback circuit.

This distinction is especially useful when a disconnected or intermittent connection produces a high reading. The summary identifies that possibility, but it does not locate the open or provide a connector pinout. The applicable vehicle circuit diagram is still necessary.

Related monitors depend on this signal

Lock, unlock and unexpected-state performance checks exclude P04C6 among their supporting circuit faults. Their silence while this high-input fault remains active may reflect inhibited evaluation rather than correct mechanical operation.

The published detection window counts repeated failures, and the calibration must enable the diagnostic. A brief valid value after reconnecting something is not equivalent to a completed successful monitor.

Document the lock-position data, connector condition found by the proper inspection and any accompanying low or invalid-range code. A complete repair verification should establish stable valid feedback and then allow the relevant performance checks to run, rather than stopping when memory has been cleared.

Application limits

Document-level 2015 GM diagnostic table; per-code vehicle/engine/calibration applicability not established.

Source

15OBDG01 Hybrid Diagnostics, physical PDF pages 595.