Diagnostic article Generic OBD-II
P2C0B: The intake B-channel low fault requires an energized output
Understand P2C0B’s electrical conditions before treating a low feedback value as a mechanically stuck profile pin.
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Documented application
2025 GM 25OBDG03B documented monitor only. Vehicle, engine and calibration applicability must be confirmed from the matching service information; no model fitment is inferred.
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.
P2C0B concerns the intake profile-position sensor B circuit’s low electrical result. GM describes a ground-short classification detected with the associated output powered on. The word low identifies the driver’s electrical behavior, not a lower camshaft profile or a pin that must be retracted.
The command separates this fault from circuit high
The voltage comparison represents impedance below 0.5 Ω toward controller ground in the documented implementation. P2C0C uses an off command to evaluate a power-short classification. Mixing those command states would make the same voltage observation answer the wrong diagnostic question.
P2C09 is the separate B-channel open-circuit result. Keeping all three electrical labels distinct avoids attributing every inactive profile mechanism to one presumed hardware failure.
Reproduce a qualified on-state check
The source requires supply above 11 V, ignition in crank or run, diagnostic enablement and an on command. Four failed samples out of five establish the result. The one-trip reporting class is not a replacement for that sampling requirement.
Preserve the B-channel command, electrical status and supply conditions. These monitor limits are not a connector pinout or instructions to load an unknown circuit. The summary does not identify the grounded path or establish whether wiring, a connected component or the output stage is at fault. Appropriate circuit information is needed for localization.
Source and applicability
2025 GM 25OBDG03B documented monitor only. Vehicle, engine and calibration applicability must be confirmed from the matching service information; no model fitment is inferred. These criteria explain controller logic, not a complete repair procedure. 25OBDG03B, PDF page 901. 25OBDG03B, PDF page 903. 25OBDG03B, PDF page 904.
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
A Camshaft Profile Actuator Position Sensor B Circuit Low 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