This page displays the exact open-licensed standardized SVG for Diesel exhaust fluid (DEF) / SCR fluid, sourced from Wikimedia Commons. Source and licence
What the AdBlue / DEF Warning symbol means
The selective catalytic reduction system may be low on fluid or have a fault; some vehicles impose a restart countdown.
Where you may see this symbol
This entry belongs to the Road Vehicles section and is grouped under Diesel & emissions. It is commonly encountered at Instrument cluster / information display. Depending on the vehicle, vessel or machine, it may appear as a lamp, display message, annunciator or control-panel symbol.
How this symbol usually looks
Can be a bottle, droplets, exhaust symbol or text countdown.
Common versions you may see
The examples below show a few realistic ways this symbol may appear. Exact geometry, wording, framing and flashing behaviour can vary by manufacturer and system design.
Primary reference
Primary reference appearance for this symbol or indicator.
Display / text variant
Displays may use abbreviations, labels or annunciator tiles instead of an isolated pictogram.
System-state variant
Colour, flash pattern or status wording may change with system state.
Detailed explanation and operating context
AdBlue / DEF Warning is indexed on SymbolDeck so users can find it by a specific symbol name or by plain-language searches such as “what does this warning light mean?” The page is designed to help with fast visual identification while still giving enough context to understand the system behind the symbol.
High is SymbolDeck’s general-reference urgency classification for this entry. Real-world urgency can change with operating state, multiple simultaneous warnings, environmental conditions and manufacturer logic. Approved documentation should always take precedence.
Safety note
For safety-critical road, aviation, marine, rail or machinery operation, this page is for identification and learning only. Approved manuals, checklists, rulebooks, placards and qualified personnel take precedence.
