KUBOTA-P20EE serious Kubota ›

SCR NOx Catalyst Efficiency Below Threshold - Bank 1

The KUBOTA-P20EE (Kubota) diesel fault code means: SCR NOx Catalyst Efficiency Below Threshold - Bank 1. This is a serious severity code.

Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.

My Garage →
Keep driving?
Limp mode only
DIY difficulty
advanced
Estimated cost
$1,800-$4,500 SCR

What Are the Symptoms of KUBOTA-P20EE?

  • Inducement countdown
  • Derate

What Causes KUBOTA-P20EE? (Most Likely First)

  • Aged SCR catalyst (high-hour machine) Likely
  • Upstream DEF dosing fault masking the real issue Likely

Can I Still Drive with KUBOTA-P20EE?

Limp mode only. KUBOTA-P20EE is rated serious severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.

Frequently Asked Questions

What is Kubota code P20EE?

Kubota P20EE means: SCR NOx Catalyst Efficiency Below Threshold - Bank 1. Serious code -- address promptly to avoid inducement / further damage.

Can I keep using my Kubota with P20EE?

Serious fault -- you can move the machine to a shop but don't run it under load. Use Kubota Diagmaster software (dealer tool) for full diagnostics.

How much does P20EE cost to fix on a Kubota?

Repair cost range: $1,800-$4,500 SCR. Compact-tractor labor is typically $110-$150/hr in 2026.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose KUBOTA-P20EE?

  1. Rule out doser faults first.

  2. Back-pressure test SCR.

  3. Check DEF quality with refractometer.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines P20EE as a generic OBD-II code)

P20EE on Other Platforms

The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:

Bobcat serious SCR NOx Catalyst Efficiency Below Threshold (Bank 1) Duramax critical SCR NOx Catalyst Efficiency Below Threshold Bank 1 Hino serious NOx Converting Catalyst Conversion Efficiency Isuzu serious Diesel Exhaust Fluid (DEF) System NOx Trap Low Efficiency Power Stroke serious SCR NOx Catalyst Efficiency Below Threshold Bank 1 Yanmar serious SCR NOx Catalyst Efficiency Below Threshold

Which Vehicles Commonly Get KUBOTA-P20EE?

  • Kubota BX1880 / BX2380 / BX23S sub-compact tractors
  • Kubota L2501 / L3301 / L3901 utility tractors
  • Kubota L4060 / L4760 / L5060 / L5460 grand L tractors
  • Kubota M5-091 / M5-111 utility tractors
  • Kubota M6S-111 / M7060 / M7-132 / M7-152 tractors
  • Kubota MX5400 / MX6000 utility tractors
  • Kubota SVL65-2 / SVL75-2 / SVL95-2s skid steer loaders
  • Kubota SSV65 / SSV75 skid steer loaders
  • Kubota RTV-X1100C / RTV-X1140 / RTV1140CPX utility vehicles

Explore More

More Kubota codes → Diesel home All diesel codes Heavy-duty Guides

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