Engine Coolant Overtemperature
The YANMAR-P0217 (Yanmar) diesel fault code means: Engine Coolant Overtemperature. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $25-$2,500
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Common Symptoms
- Overheat alarm + shutdown timer on ViO excavator
- Marine overheat alarm on Yanmar 4JH / 6LY
Probable Causes (Ranked by Likelihood)
- Plugged radiator core with chaff/mud (tractor) or clogged raw water strainer (marine) Very Likely
- Failed marine impeller / seawater pump Likely
- Stuck thermostat Possible
- Blown head gasket Less Likely
Frequently Asked Questions
What is Yanmar code P0217?
Yanmar P0217: Engine Coolant Overtemperature. This code is reported on Yanmar equipment running the described engine family.
Can I keep working with Yanmar code P0217?
Do not continue operating. Risk of engine damage or unsafe shutdown.
How much does Yanmar P0217 cost to fix?
Estimated repair cost: $25-$2,500. 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
Tractor/excavator: clean radiator from inside out.
Marine: clear strainer, inspect impeller (annual replacement), confirm heat exchanger flow.
Check thermostat operation.
Pressure-test cooling system.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0217 as a generic OBD-II code)
P0217 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
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)
- Hunter / Beneteau / Catalina sailboats with Yanmar 3JH / 4JH
- Trawlers and sport fishing boats with Yanmar 6LY / 6LF series
- Sailboat auxiliaries with Yanmar 2YM / 3YM / 3JH5 diesels
- Commercial fishing vessels with Yanmar 6LY3-UTP
- Yachts with Yanmar 6LY400 / 6LY440 / 8LV common-rail marine diesels
- Workboats with Yanmar 4LV / 4JH series marine propulsion
- Ski boats and express cruisers with Yanmar marine diesels
- Tenders and RIBs with Yanmar 3YM20 / 3YM30 sailboat aux
- Island-hopper ferries with Yanmar 6AYM / 6HYM commercial series
- Tug boats and small workboats with Yanmar 6HAL-HTP / 6HYM
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