If a developer requests fuel.reserved.proprietary but the key is misspelled ( fuel.reserved.proprietry ) or missing from the bundle, a fallback mechanism may return the —or an undefined literal.
It is important to clarify that is not a standard industry term found in automotive engineering, petroleum chemistry, or software localization. undefined fuel-reserved for proprietary
| Step | Action | |------|--------| | | Identify the exact software/firmware version. | | 2 | Check localization files ( .po , .json , .resx , .strings ) for the key fuel.reserved.proprietary or similar. | | 3 | If found, correct the default value or add the missing translation. | | 4 | If not found, search the codebase for the hardcoded string "fuel-reserved" . | | 5 | Inspect CAN bus or MODBUS register maps for proprietary/unmapped IDs. | | 6 | Update the device firmware or the interpreting software (OBD scanner, dashboard). | | 7 | If it appears in a fleet API response, contact the vendor for a schema definition. | Developer Fix (Pseudo-code) // BAD - causes undefined let fuelReserveStatus = undefined; console.log(`$fuelReserveStatus fuel-reserved for proprietary`); // GOOD - define your enums const FuelReserveType = STANDARD: "standard", PROPRIETARY: "proprietary", UNDEFINED: "unknown" ; If a developer requests fuel
If a generic reader tries to decode a proprietary SPN without the manufacturer’s database, it may show: | | 2 | Check localization files (
| Key | en-US | de-DE | fr-FR | |-----|-------|-------|-------| | fuel.reserved.capacity | "Reserved fuel capacity: 0 L" | "Reservekraftstoffkapazität: 0 L" | "Capacité de carburant réservée : 0 L" | | fuel.reserved.proprietary | "Proprietary fuel blend reserved" | "Geschützte Kraftstoffmischung reserviert" | "Mélange de carburant exclusif réservé" |