BOBCAT-U0100 critical Bobcat ›

Lost Communication with ECM / PCM A

The BOBCAT-U0100 (Bobcat) diesel fault code means: Lost Communication with ECM / PCM A. This is a critical 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?
No — stop driving
DIY difficulty
advanced
Estimated cost
$150-$3,500

What Are the Symptoms of BOBCAT-U0100?

  • No-start, blank cluster, multiple warning lamps

What Causes BOBCAT-U0100? (Most Likely First)

  • Broken CAN wire between controller and ECM (rubbing point in loader arm) Likely
  • Failed ECM Possible
  • Blown ECM power fuse Possible

Can I Still Drive with BOBCAT-U0100?

No — stop driving. BOBCAT-U0100 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.

Frequently Asked Questions

What is Bobcat code U0100?

Bobcat U0100: Lost Communication with ECM / PCM A. This code is reported on Bobcat equipment running the described engine family.

Can I keep working with Bobcat code U0100?

Do not continue operating. Risk of engine damage or unsafe shutdown.

How much does Bobcat U0100 cost to fix?

Estimated repair cost: $150-$3,500. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Bobcat Service Analyzer) is usually required.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose BOBCAT-U0100?

  1. Check ECM power at key-on; verify fuse.

  2. Terminate CAN with 60-ohm resistor reading across the bus.

  3. Flex-test harness at pivot points.

U0100 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 U0100 Duramax serious Lost Communication with ECM/PCM A Hino serious Lost Communication with ECM/PCM Isuzu serious Lost Communication with ECM/PCM Kubota serious Lost Communication with ECM/PCM MaxxForce moderate Lost Communication with ECM PACCAR serious Lost Communication with ECM/PCM Yanmar critical Lost Communication with ECM

Which Vehicles Commonly Get BOBCAT-U0100?

  • Bobcat S650 skid steer loader (Kubota V3800)
  • Bobcat S740 / S750 / S770 / S850 skid steer loaders (Kubota V3800)
  • Bobcat T650 / T750 / T770 / T870 compact track loaders (Kubota V3800)
  • Bobcat E50 / E55 / E60 / E85 mini excavators (Kubota V3800)
  • Bobcat UW56 utility vehicle (Kubota V3800)
  • Bobcat S630 / S650 skid steer loaders (Doosan D24)
  • Bobcat S770 / S850 skid steer loaders (Doosan D34)
  • Bobcat T630 / T650 / T870 compact track loaders (Doosan D24/D34)
  • Bobcat E55 / E85 mini excavators (Doosan D24)

Explore More

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

Was this helpful?

Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.