BOBCAT-P0401 moderate Bobcat ›

EGR Insufficient Flow Detected

The BOBCAT-P0401 (Bobcat) diesel fault code means: EGR Insufficient Flow Detected. This is a moderate severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
intermediate
Estimated cost
$0-$800
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Common Symptoms

  • Regen lamp blinking
  • Slight power loss

Probable Causes (Ranked by Likelihood)

  • Sooted EGR valve (short-duty skid-steer work) Very Likely
  • Plugged EGR cooler Likely
  • Failed EGR position sensor feedback Possible

Frequently Asked Questions

What is Bobcat code P0401?

Bobcat P0401: EGR Insufficient Flow Detected. This code is reported on Bobcat equipment running the described engine family.

Can I keep working with Bobcat code P0401?

Usually drivable short-term, but fix soon to avoid derate or DPF issues.

How much does Bobcat P0401 cost to fix?

Estimated repair cost: $0-$800. 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

Step-by-Step Diagnostic Procedure

  1. Command EGR sweep in Service Analyzer, verify position feedback.

  2. Remove valve and inspect for carbon packing -- clean with carb cleaner and soft brush.

  3. Force parked regen when complete.

Sources 1

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

  • SAE J2012Diagnostic Trouble Code Definitions (defines P0401 as a generic OBD-II code)

P0401 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 P0401 Duramax moderate Exhaust Gas Recirculation Flow Insufficient Detected Hino moderate EGR Flow Insufficient Isuzu moderate EGR Flow Insufficient Kubota moderate EGR Flow - Insufficient PACCAR moderate EGR Flow Insufficient Power Stroke moderate Exhaust Gas Recirculation Flow Insufficient Yanmar moderate EGR Insufficient Flow Detected

Commonly Affected Vehicles

  • 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)

Related Codes

BOBCAT-P0402BOBCAT-M0309

Explore More

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

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