DEF Systems Market Pricing
Current market data for 5,694 Diesel Exhaust Fluid (DEF) system listings.
What you'll usually pay
💡 Used ones cost about 19% more here.
👉 In short easy summary
The best value is found in DEF Control Modules, which sit 25% below the market median. Conversely, DEF Pumps command a premium at 53% above the median.
💚 Best value for your money
Price by brand
Why? Prices vary by manufacturer, with International at 287.5 and Volvo at 226.89.
Price by type
Why? Component complexity drives costs, ranging from DEF Control Modules at 142.48 to DEF Pumps at 290.
🛒 Some on sale right now
Common questions
What is the median price for a DEF Tank?
The median price for a DEF Tank is 250.
Which brand has the lowest median price among the listed options?
Volvo has the lowest median price at 226.89.
How does the price of new DEF systems compare to used ones?
New systems have a median price of 180, while used systems have a median price of 214.96.
How we got these numbers
Worked out from 200 live eBay listings (price range $28–$434, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 17, 2026.