KUBOTA-U0121 serious Kubota ›

Lost Communication with ABS Module

The KUBOTA-U0121 (Kubota) diesel fault code means: Lost Communication with ABS Module. 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
$400-$1,200 ABS module

What Are the Symptoms of KUBOTA-U0121?

  • ABS lamp
  • Brake assist disabled

What Causes KUBOTA-U0121? (Most Likely First)

  • Failed ABS module (M7 class) Possible
  • CAN wiring damage Likely

Can I Still Drive with KUBOTA-U0121?

Limp mode only. KUBOTA-U0121 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 U0121?

Kubota U0121 means: Lost Communication with ABS Module. Serious code -- address promptly to avoid inducement / further damage.

Can I keep using my Kubota with U0121?

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 U0121 cost to fix on a Kubota?

Repair cost range: $400-$1,200 ABS module. Compact-tractor labor is typically $110-$150/hr in 2026.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose KUBOTA-U0121?

  1. Scan bus with Diagmaster.

  2. Check module power/ground.

U0121 on Other Platforms

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

Gas / Automotive (OBD-II) Generic OBD-II definition for U0121 Bobcat moderate Lost Communication with ABS / Traction Control Module Duramax serious Lost Communication with ABS Module Hino moderate Lost Communication with ABS Control Module Isuzu moderate Lost Communication with ABS Control Module PACCAR serious Lost Communication with ABS Module

Which Vehicles Commonly Get KUBOTA-U0121?

  • Kubota M7-132 / M7-152 / M7-172 premium tractors

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

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