P2315: Separating ignition circuit low from a combustion misfire

P2315 is an electrical low-side ignition-driver check in the cited GM file. Its trigger is a low signal while the driver is switched off, which the table interprets as a short toward ground. That evidence differs from a misfire counter: it describes the control circuit rather than proving whether combustion succeeded.

The continuation page matters

The row begins on page 701 and continues on page 702. Together they require synchronized ignition, speed above 1,400 rpm and more than nine ignition-counter increments. Reading only the first page would miss part of the eligibility logic. Confirmation is listed as 0.4 seconds, with two-trip reporting.

A useful verification record therefore includes whether those firing events occurred and whether the suspect low reading belonged to an off interval. An observation made before the monitor becomes eligible is not a pass of this check.

Do not guess the coil location

The generic definition calls the channel coil F; this source labels it coil E. The relationship between those naming conventions is not established, so this article cannot supply a reliable cylinder mapping. Obtain the correct vehicle circuit identity first. The supported next distinction is between an electrical low fault and a combustion complaint, not between speculative replacement parts.

Document scope and source

2025 GM 25OBDG07A Part 2 documented monitor only; its application-matrix filename join is unresolved. No model, engine or universal calibration applicability is inferred. These figures explain the cited controller logic, not a vehicle-specific repair instruction. Match the vehicle’s service information before applying them.

GM physical PDF page 701, GM physical PDF page 702.