P0611: This diesel injector-module fault monitors an internal voltage quantity

P0611 is the fuel-injector control-module performance classification in Ford’s diesel ECU-monitor section. Its documented criterion concerns a raw internal ECU voltage measurement used for fuel-system nominal-voltage calibration. It is not a measurement of rail pressure or an individual injector’s delivered fuel quantity.

The entry state is specifically identified

Ford lists P0611 as continuously monitored with a five-second duration. Unlike the broader neighboring ECU-entry grouping, the P0611-specific condition is engine running or cranking. That distinction prevents importing every adjacent speed prerequisite into this code’s test.

The published raw measurement falls outside the stated 0–3,300 mV interval for the monitoring duration. These are internal measurement criteria. They are not a connector-pin specification or permission to inject a test voltage into an ECU circuit.

Preserve internal and external evidence separately

Record the complete code, running/cranking state and any related supply or injector-control findings. A normal external battery measurement cannot, by itself, establish that the internal nominal-voltage measurement behaved correctly during the event.

The summary does not identify a failed internal chip, condemn an injector or provide a universal module-replacement instruction. Vehicle-specific diagnosis must determine whether the internal performance report is reproducible and what supporting evidence explains it. Fuel-pressure complaints and injector balance results remain separate observations, rather than substitutes for the documented electrical-calibration check.

Source and applicability

Ford 2023–2024 diesel OBD summary, August 25, 2023 revision; only the described monitor examples. Confirm the engine and calibration before applying values. The monitor explanation does not identify a failed part or replace the applicable service procedure. Ford PDF, page 104. Ford PDF, page 105.