BOBCAT-P0299 serious Bobcat ›

Turbocharger Underboost

The BOBCAT-P0299 (Bobcat) diesel fault code means: Turbocharger Underboost. 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?
Limited driving only
DIY difficulty
intermediate
Estimated cost
$50-$2,500

What Are the Symptoms of BOBCAT-P0299?

  • Severe power loss / slow cycle times
  • Black smoke under load
  • Turbo whistle changes pitch

What Causes BOBCAT-P0299? (Most Likely First)

  • Split intercooler boot (radiator frame flex) Very Likely
  • Stuck/sooted VGT vanes on Kubota turbo Likely
  • Plugged air filter / plugged DPF creating back-pressure Possible
  • Failed boost pressure sensor Possible

Can I Still Drive with BOBCAT-P0299?

Limited driving only. BOBCAT-P0299 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What is Bobcat code P0299?

Bobcat P0299: Turbocharger Underboost. This code is reported on Bobcat equipment running the described engine family.

Can I keep working with Bobcat code P0299?

Limited operation only -- finish the current task then shut down for repair.

How much does Bobcat P0299 cost to fix?

Estimated repair cost: $50-$2,500. 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-P0299?

  1. Pressurize intake with smoke machine and locate leaks.

  2. Scan VGT position command vs. actual; command sweep via Service Analyzer.

  3. Check DPF back-pressure and differential; force regen if indicated.

Sources 1

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

  • SAE J2012Diagnostic Trouble Code Definitions (defines P0299 as a generic OBD-II code)

P0299 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 P0299 Duramax serious Turbo/Super Charger Underboost Hino serious Turbo/Super Charger Underboost Isuzu serious Turbo/Super Charger Underboost Kubota serious Turbocharger Underboost PACCAR serious Turbo/Super Charger Underboost Perkins serious Turbocharger Underboost Yanmar serious Turbocharger Underboost

Which Vehicles Commonly Get BOBCAT-P0299?

  • 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)

Explore More

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

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