Diagnostic article Generic OBD-II
P03F3: Do not reproduce a high exhaust profile-C fault from a contradictory state note
Learn the supported GM P03F3 power-directed circuit meaning and the unresolved on/off instruction in the published monitor table.
Read before applying this article
Documented application
2025 GM 03B documented monitor only. Vehicle, engine and controller calibration applicability must be established separately; no model fitment is inferred from the file.
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.
P03F3 is a high-circuit code for exhaust profile actuator C on bank 1. GM's documented output is exhaust profile actuator 3. The strategy describes feedback consistent with a connection toward controller power, rather than excessive mechanical actuator travel.
A source conflict changes the test setup
The narrative places the voltage assessment in the powered-off state, and the malfunction description agrees. The enable column nevertheless states that the driver is commanded on. Those entries do not define a single consistent operating state, so the intended reproduction command must be verified elsewhere in the applicable service information.
The row also specifies signal-to-power impedance below 0.5 Ω, system supply above 11 V, enabled monitoring and crank/run ignition. Four failures in five samples confirm the documented finding. These figures remain monitor specifications, not a connector-level repair procedure.
Preserve evidence before choosing a direction
Record the command and feedback for the actual exhaust profile-3 channel at the event. A voltage trace without command history cannot decide whether the driver behaved normally for its state. Nor can a measurement from another profile output settle this channel's diagnosis.
The supported electrical classification remains useful for separating P03F3 from open-circuit and ground-directed faults. It does not identify a failed actuator or controller, and the contradictory state note should not be resolved by silently rewriting the manufacturer's table.
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 445.
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
B Camshaft Profile Actuator C Control Circuit High Bank 1
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