Diagnostic article Generic OBD-II
P216F: A high group F supply fault is an off-state relationship to controller power
Learn why GM P216F cannot be diagnosed from an isolated injector voltage without its command and reference.
Read before applying this article
Documented application
2025 GM 06B 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.
P216F names the high supply-circuit condition for injector group F. The cited GM strategy monitors the output called injector 6 high-side driver while it is switched off. The electrical classification is a connection toward power, not a direct finding of excessive injection quantity.
The relevant comparison uses two voltages
The table specifies a difference of at most one volt between signal and controller power. That is a relative criterion. It does not instruct a reader to look for one volt from the signal to chassis ground, and it does not identify a connector terminal for an external test.
Battery voltage of at least 11 V and absence of the stated P062B fault conditions are prerequisites. The confirmation history is ten failed samples within twenty on a 100-millisecond loop, with one-trip reporting.
Keep the off command in the record
A high signal during an intended on period may have a different meaning from the same signal during the documented off test. Capture command, output and power reference together so that the comparison is not reconstructed from unrelated moments.
The output-6 label is specific to this GM implementation and must not become a universal physical cylinder assignment for group F. The monitor does not locate the power-directed path inside the injector, harness or controller. Further circuit checks and any replacement decision require the matching vehicle service procedure.
Source and applicability
2025 GM 06B 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 442.
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
Fuel Injector Group F Supply Voltage Circuit High
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