The card used (e.g., WEX or Voyager) is restricted to certain fuel types, and the dispenser is signaling a code reserved for "Proprietary Use" that the network has not authorized for this specific account.
When a fleet or a fuel station offers a specialized blend (e.g., a specific racing fuel, a custom additive blend, or a local experimental biofuel) that isn't on the national list, they use these "Proprietary" codes to: undefined fuel-reserved for proprietary
The data is unique to a specific vendor or internal process and is not intended for general public or third-party visibility. (like SAP) or a legal/compliance The card used (e
: The Point of Sale (POS) terminal at the gas station sent a product code that your fleet card issuer's software doesn't have in its Alternative Fuel Code New Fuel Types Check if the POS requires a software update
Allow their internal systems to recognize the purchase even if the wider network doesn't.
Check if the POS requires a software update to recognize newer alternative fuel codes.