Diagnostic article Generic OBD-II
P03F1: Exhaust profile C is an electrical channel, not a bank-wide diagnosis
Learn how GM P03F1 assesses the energized exhaust profile-actuator 3 circuit and what its open classification establishes.
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.
P03F1 identifies an open control circuit for exhaust profile actuator C on bank 1. GM's cited monitor names that channel exhaust profile actuator 3. The diagnostic selects one output and tests its electrical response, so a general camshaft symptom does not establish the same finding.
An on-state feedback failure defines the open result
The controller compares driver voltage with its own acceptable range while the output is powered on. The open-circuit specification corresponds to more than 200 kΩ between signal and controller ground. This describes the controller's classification; the document does not publish a connector pinout or a direct resistance-measurement procedure.
Supply above 11 V, crank/run ignition and diagnostic enablement create the valid test window. Four failures within five samples confirm the condition, followed by the listed one-trip reporting. A lone inactive-state reading is not equivalent to repeated abnormal feedback under command.
Verify the correct output before isolating the circuit
Match the recorded command and feedback to exhaust profile actuator 3. A healthy result from another exhaust output does not prove this path is connected. Likewise, apparent absence of profile movement does not reveal whether this particular electrical monitor had an eligible on command.
Once the commanded electrical discrepancy is established, wiring, load and controller isolation require the exact service information. The table does not identify which component caused the open classification or support replacing mechanical timing parts solely from P03F1.
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 443.
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/Open 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