YANMAR-P0118 moderate Yanmar ›

Engine Coolant Temperature Sensor High

The YANMAR-P0118 (Yanmar) diesel fault code means: Engine Coolant Temperature Sensor High. This is a moderate severity code.

My Garage →
Keep driving?
No — stop driving
DIY difficulty
beginner
Estimated cost
$40-$200

What Are the Symptoms of YANMAR-P0118?

  • False overheat warning / derate

What Causes YANMAR-P0118? (Most Likely First)

  • Open ECT sensor wire Likely
  • Failed ECT sensor biased high Possible

Can I Still Drive with YANMAR-P0118?

No — stop driving. YANMAR-P0118 is rated moderate severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.

Frequently Asked Questions

What is Yanmar code P0118?

Yanmar P0118: Engine Coolant Temperature Sensor High. This code is reported on Yanmar equipment running the described engine family.

Can I keep working with Yanmar code P0118?

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

How much does Yanmar P0118 cost to fix?

Estimated repair cost: $40-$200. 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

How Do You Diagnose YANMAR-P0118?

  1. Scan ECT sensor voltage; should show coolant temp.

  2. Ohm-test sensor cold and hot.

Sources 1

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

  • SAE J2012Diagnostic Trouble Code Definitions (defines P0118 as a generic OBD-II code)

P0118 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 P0118 Duramax moderate Engine Coolant Temperature Sensor 1 Circuit High Kubota moderate Engine Coolant Temperature Sensor Circuit High Power Stroke moderate Engine Coolant Temperature Sensor Circuit High Input

Which Vehicles Commonly Get YANMAR-P0118?

  • 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)

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