If you have white crystal deposits in your Selective Catalytic Reduction (SCR) system, you could end up with significant impacts on your diesel vehicle’s performance.
These DEF crystals form when the water component of urea-based DEF evaporates, which leaves behind a crystallized solid urea residue. Knowing how to address this problem – and the steps to prevent further issues – can save you time, money, and headaches down the road!
What are the Signs of DEF Crystal Contamination?
There are a few indicators that may suggest DEF crystal buildup in your system. Watch for the most obvious, such as dashboard warning lights – but also keep an eye on decreased fuel efficiency and reduced vehicle power.
In severe cases, your vehicle may enter “limp mode,” operating at significantly reduced speeds or failing to run altogether.
The most common OBD codes associated with crystal buildup include:
- P20EE
- P20EF
- P204F
- P207F
- P20E8
- P218F
If your vehicle displays these codes, you should take steps quickly to address the issues within your SCR system.
Effective Cleaning Solutions
So, how can you clean your system effectively to prevent the worst damage? NuDEF Diesel Exhaust Fluid Additive & Stabilizer is a premium solution for preventing (and addressing existing) crystallization issues.
Adding NuDEF Diesel Exhaust Fluid Additive & Stabilizer to your tank helps dissolve existing crystal deposits throughout the SCR system and actively prevents any new formations.
For a thorough cleaning, you’ll want to make sure that the product reaches all components – including the tank, pump, heater, sender, lines, injector, decomposition tube/reactor, and mixer. This is the best way to help restore SCR function and clear related OBD codes.
With DEF Performance, Prevention is Key
Always maintain your regular maintenance using quality DEF additives like NuDEF. Vehicles regularly driven at low speeds with light loads are especially susceptible to developing white crystal deposits, making it all the more important to stay current on your preventative maintenance.
Adding NuDEF to your maintenance routine improves DEF fluid performance, keeps the SCR system clean, and extends the longevity of emissions components.
FAQ about How to Clean Crystallized DEF
What causes DEF crystallization?
Crystallization commonly occurs due to leakage, overfilling, improper handling, poor quality DEF, or contamination with diesel fuel or other chemicals.
Can crystallized DEF damage my engine?
While not directly damaging the engine, crystal deposits can clog SCR system components, leading to reduced performance, increased fuel consumption, and potentially costly repairs.
How often should I use DEF additives?
For optimal performance, add NuDEF to your DEF tank with each refill to maintain system cleanliness and prevent crystal formation.