P2560: Ford low-coolant check inferred from oil and coolant temperatures

P2560 is labeled engine coolant level low, but the documented Ford 2015 diesel monitor uses temperature relationships. It requires acceptable engine-coolant and oil-temperature information and evaluates whether oil temperature is more than 50°C above coolant temperature. This is an inferred coolant-system check, not a direct measurement of liquid height in the reservoir.

What enables the inference

Ford lists oil temperature of at least 70°C and a typical five-second monitoring duration. The oil must be warm enough for the temperature comparison to become meaningful. A cold-engine level inspection and this running temperature inference are different kinds of evidence.

The page contains inherited oil-sensor headings beneath its coolant-system check title. The actual DTC and stated comparison are clear, but those headings should not be used to invent a separate oil-sensor circuit test.

Confirm the physical condition

Preserve both temperature readings and verify their credibility. The code alone cannot prove the amount or location of a coolant loss, and a biased temperature input can complicate interpretation. Follow the vehicle's cooling-system diagnostic procedure and coolant-check instructions. Never open a hot pressurized cooling system to investigate the code; the OBD summary supplies no safe pressure-release procedure.

Source and applicability

Ford 2015 model-year diesel OBD system operation summary, revision December 22, 2014; the cited monitor only, without blanket model or engine applicability. Ford source, physical PDF page 110. The documented monitor explains the fault decision; vehicle-specific service information is still needed for connector identification and a complete repair procedure.