P23C6: coolant bypass valve C motor driver overcurrent

P23C6 is generically described as excessive driver current or temperature. The cited GM row specifically documents motor-current monitoring for coolant bypass valve C. It checks current while the H-bridge is energized and uses the driver's overcurrent status.

What the numerical entry means—and does not mean

The threshold cell prints “8.1 A < X < 12.8 A” beside the controller-specific overcurrent description. It does not clearly define a universal fixed trip current or a safe normal operating range. The supported interpretation is an energized-driver overcurrent diagnosis; the exact applicable limit needs calibration confirmation.

The monitor requires valid run/crank, no engine cranking, an enabled diagnostic system and a determinate driver status. The condition is evaluated for two seconds within a five-second window. Reporting is Type B, two trips.

Diagnostic direction

A motor-command observation without current or driver-status evidence does not establish this fault. Conversely, the code alone cannot distinguish a mechanical load problem from an electrical or driver problem. Preserve the command, current-related data and driver status where available, then follow the specific service test. Verification must include the energized operating state that invokes the monitor. A key-on check with an inactive H-bridge leaves the documented overcurrent test unanswered.

Source and application limits

This explanation covers the cited 2025 GM monitor. Confirm the vehicle and calibration in its service information before applying these limits; inclusion in this file does not establish model compatibility. GM diagnostic parameters, PDF page 821.