P268E: cylinder 3 injector adjustment data is unprogrammed

P268E belongs to cylinder 3 injector data. The GM strategy checks the end-of-line injector adjustment code, identified in the row as DID $62, and fails if that record has not been programmed. This is narrower than a general statement that the installed injector is mechanically incompatible.

What a passing result requires

The source defines success as successful programming of the EIA code. It lists ignition on, calibration enablement and controller production/development qualifications. Type A, one-trip reporting applies, without a specified sample counter or duration.

Reading the service evidence

A programming tool's connection to the vehicle is not the same evidence as a successfully stored cylinder-3 record. Review the completion result and the supported record status using the applicable service process. Likewise, acceptable engine operation does not independently satisfy this data-presence test.

The DID identifies the record in this documented controller; it should not be generalized into a raw write instruction for another calibration. Confirm cylinder numbering and the correct injector-specific adjustment data before any authorized coding. Verification should be based on the resulting cylinder-3 data check, not simply DTC clearing. No injector-flow limit, physical location or parts-replacement conclusion is supplied by this monitor, so separate electrical or mechanical complaints require their own evidence.

Source and application limits

This explanation covers the cited 2025 GM monitor. Confirm the vehicle and calibration in its service information before applying these limits; inclusion in this file does not establish model compatibility. GM diagnostic parameters, PDF page 1511.