P03ED: The third intake profile output is checked for a ground-directed fault

P03ED is the low-circuit diagnostic for bank 1 intake profile actuator C. In the documented GM implementation, intake profile actuator 3 is powered on and its driver feedback is assessed for a short-to-ground condition. The fault identifies an electrical behavior on that output, not an observed mechanical cam-position error.

Establish the commanded operating window

The driver uses controller-specific voltage thresholds corresponding to a signal-to-ground impedance below 0.5 Ω. This explains the classification without supplying a connector-level test method. An output that is intentionally inactive may have different expected feedback, so its low reading cannot be substituted for an on-state result.

The published enables require a commanded-on driver, supply above 11 V, an enabled diagnostic and crank/run ignition. Four failed samples within five produce the reported condition. The one-trip classification should not be mistaken for evidence that the circuit remained abnormal for the full trip.

Avoid a bank-wide conclusion

Preserve the command and feedback for actuator 3 specifically, together with supply at the event. A healthy response from another profile channel cannot verify this one. If the evidence appears only during commands, retain that timing relationship for the applicable circuit investigation.

The source supports a ground-directed classification but does not locate its cause inside the actuator, harness or controller. It also gives no basis for replacing mechanical timing parts before resolving the electrical evidence.

Source and applicability

2025 GM 03B documented monitor only. Vehicle, engine and controller calibration applicability must be established separately; no model fitment is inferred from the file. GM PDF, physical page 439.