Diagnostic article Generic OBD-II
P2B0E: Cylinder 7’s missing pulse signature needs the catalyst warm-up context
See how P2B0E separates a cold-start injector response from later normal running behavior.
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Documented application
2025 GM 25OBDG06A 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.
P2B0E describes cylinder 7 injection-pulse performance during catalyst warm-up. The cited GM controller relies on the electrical signature produced by movement within the injector. Its concern is a commanded pulse without adequate opening evidence, rather than a generic statement that every injection from that cylinder failed.
Preserve the event that made the check possible
Catalyst warm-up must be enabled, the small-pulse diagnostic active and voltage-feedback data ready. These are explicit prerequisites. A later clean scan after the engine has warmed does not, by itself, show that the same diagnostic opportunity was repeated.
The source lists cylinder-event sampling over 50–100 samples. That monitoring span differs from the two-trip reporting classification, and neither should be treated as a universal injector-opening time.
Interpret the feedback through its supporting data
GM uses an opening-magnitude metric, with supporting calibration data indexed by fuel-rail pressure and separate multipulse operating limits. The metric is part of the controller’s signal interpretation. It is not a stand-alone harness-voltage specification or direct fuel-flow measurement.
Useful verification aligns the cylinder 7 command, operating mode and feedback readiness with the recorded result. A pulse that was commanded but lacks movement evidence requires a different investigation from a combustion imbalance inferred elsewhere. The summary does not decide whether the cause is inside the injector, in its drive path or in signal interpretation; a matching diagnostic procedure must resolve that.
Source and applicability
2025 GM 25OBDG06A 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. 25OBDG06A, PDF page 564. 25OBDG06A, PDF page 823. 25OBDG06A, PDF page 824.
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
Cold Start Cylinder 7 Injection Pulse Performance
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