Technical manuals for hardware like the Gasboy EMV system list these as "Undefined Fuel" blocks reserved for future or private use.
Ironically, the string "for proprietary" signals that the system attempted to hide something—but failed. If a diagnostic tool exposes proprietary CAN IDs or reserved fuel parameters, a competitor could reverse-engineer the reserve logic. This is why OEMs rigorously validate their string tables before release. undefined fuel-reserved for proprietary
The space is specifically set aside for fuel-related data (e.g., emissions, type, or batch numbers). Proprietary: Technical manuals for hardware like the Gasboy EMV
In the world of On-Board Diagnostics (OBD), codes are generally split into two categories: This is why OEMs rigorously validate their string
Proprietary fuels are exponentially more expensive and harder to acquire than traditional fuel sources.
The phrase appears when your scanner detects a manufacturer-specific code related to the fuel system, but the scanner’s internal database doesn't have the specific definition for that code. Instead of leaving the screen blank, the software displays this generic "reserved" message. Common Causes