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P0217 — Engine Coolant Over-Temperature Condition
CriticalCoolingStop as soon as it's safe
Seen on: Heavy Truck
Engine Coolant Over-Temperature Condition. Common causes: Thermostat stuck closed.
Don't risk it — get a diesel tech on the truck.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Critical. Stop as soon as it's safe.
Most likely causes
- Thermostat stuck closed
- Low coolant level
- failed water pump
- clogged radiator
First moves (roadside)
- Check coolant level
- test thermostat
- inspect radiator for blockage
FAQ
What does P0217 mean?
Engine Coolant Over-Temperature Condition. Common causes: Thermostat stuck closed.
How serious is P0217?
Critical — Stop as soon as it's safe.
What's the most likely cause of P0217?
The most common cause is: Thermostat stuck closed. Other possibilities include Low coolant level; failed water pump; clogged radiator.
Can I keep driving with P0217?
Stop as soon as it's safe. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.