YANMAR-P0087 critical Yanmar ›

Fuel Rail Pressure Too Low

The YANMAR-P0087 (Yanmar) diesel fault code means: Fuel Rail Pressure Too Low. This is a critical severity code.

My Garage →
Keep driving?
No — stop driving
DIY difficulty
intermediate
Estimated cost
$30-$70 filter / $800-$2,000 HP pump
Built for Diesel — Not a Car Reader
ANCEL HD7000 Heavy-Duty Diesel Scanner

A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).

Check Price on Amazon
FOXWELL HD301 Diesel Truck Scanner
Lower-Cost Diesel Option
FOXWELL HD301 Diesel Truck Scanner

Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.

Check Price on Amazon

Affiliate links — we earn a commission at no extra cost to you.

Common Symptoms

  • No start on SA424 / YT359 tractor
  • Power loss / derate on ViO excavator
  • Stall under load

Probable Causes (Ranked by Likelihood)

  • Plugged primary fuel filter (Yanmar service interval 500 hr) Very Likely
  • Air in fuel from stale seasonal fuel or empty tank Likely
  • Weak electric lift pump Possible
  • Failed SCV on Yanmar HP pump Possible
  • Worn HP pump Less Likely

Frequently Asked Questions

What is Yanmar code P0087?

Yanmar P0087: Fuel Rail Pressure Too Low. This code is reported on Yanmar equipment running the described engine family.

Can I keep working with Yanmar code P0087?

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

How much does Yanmar P0087 cost to fix?

Estimated repair cost: $30-$70 filter / $800-$2,000 HP pump. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Yanmar SmartAssist / YDT) is usually required.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. Connect Yanmar SmartAssist-Direct or YDT -- confirm P0087 active and read target vs. actual rail pressure.

  2. Replace primary fuel filter and bleed system through priming pump.

  3. Check lift pump pressure at filter inlet (spec 25-35 psi).

  4. Run SCV command test in SmartAssist.

  5. If rail pressure cannot reach 30 MPa at crank, HP pump is suspect.

Sources 1

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

  • SAE J2012Diagnostic Trouble Code Definitions (defines P0087 as a generic OBD-II code)

P0087 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 P0087 Bobcat critical Fuel Rail Pressure Too Low Duramax critical Fuel Rail / System Pressure Too Low Hino serious Fuel Rail / System Pressure Too Low Isuzu serious Fuel Rail / System Pressure Too Low Kubota critical Fuel Rail Pressure Too Low PACCAR serious Fuel Rail Pressure Too Low Perkins critical Fuel Rail Pressure Too Low

Commonly Affected Vehicles

  • Yanmar SA221 / SA324 / SA424 compact tractors
  • Yanmar YT235 / YT347 / YT359 compact tractors
  • Yanmar LX4100 / LX4900 utility tractors
  • Yanmar ViO17 / ViO25 / ViO35 / ViO45 / ViO55 / ViO80 mini excavators
  • Yanmar B27-3 / B37-3 / B50-3 compact excavators
  • Cub Cadet Yanmar Ex3200 / Lx410 compact tractors (rebadged)
  • John Deere 17G / 26G / 35G compact excavators (Yanmar powered)
  • Takeuchi TB210R / TB216 / TB230 mini excavators (Yanmar powered)

Related Codes

YANMAR-P0088YANMAR-P0089YANMAR-P0093

Explore More

More Yanmar 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.