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P0217 — Engine Coolant Over-Temperature Condition

What it means: Engine Coolant Over-Temperature Condition.

How serious / can you keep driving: Critical. Stop as soon as it's safe.

Check first: Check coolant level

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CriticalCoolingStop as soon as it's safe

Seen on: Heavy Truck

What P0217 means

Engine Coolant Over-Temperature Condition. Common causes: Thermostat stuck closed.

How serious is it?

Critical. Stop as soon as it's safe.

Most likely causes

  1. Thermostat stuck closed
  2. Low coolant level
  3. failed water pump
  4. clogged radiator

First moves (roadside)

  1. Check coolant level
  2. test thermostat
  3. 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.

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Related codes

Codes that commonly appear alongside P0217, or share the same subsystem.

Same symptom: Running hot

Other codes that show up as coolant temperature climbing or a hot-engine lamp.

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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.