Diesel Vehicle Error Code P20EE: How to Fix It

Q: What causes P20EE error code in diesel vehicles?

P20EE is typically caused by contaminated or old DEF fluid, clogged DEF injector, faulty NOx sensors, damaged SCR catalyst, or DEF system leaks. Poor quality DEF fluid is the most common culprit.

Q: Can I drive my diesel truck with P20EE code?

You can drive temporarily, but the vehicle may enter reduced power mode after a certain number of miles or engine starts. The code indicates emission system problems that must be addressed to prevent engine derate.

Q: How much does it cost to fix P20EE?

Costs range from $50 for DEF fluid replacement to $3,000+ for SCR catalyst replacement. Most common fixes involve DEF system cleaning or NOx sensor replacement, typically costing $200-800 in parts and labor.

Q: How often should DEF fluid be changed?

DEF doesn't have a specific change interval, but should be replaced every 12-18 months or if contaminated. Always use fresh DEF and avoid storing opened containers for extended periods.

Q: What happens if I ignore P20EE code?

Ignoring this code can lead to engine power reduction, speed limitations, and eventually engine shutdown in some vehicles. It also increases harmful emissions and may cause damage to other emission system components.

Abstract

Error code P20EE indicates your diesel vehicle's SCR (Selective Catalytic Reduction) NOx catalyst efficiency has dropped below the acceptable threshold. This means the DEF (Diesel Exhaust Fluid) system isn't properly reducing nitrogen oxides in your exhaust, which can lead to increased emissions and potential engine derate.