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
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.
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?
Typical 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.
P0217 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: