P0217: Engine Coolant Over Temperature Condition
Severity: high
What it means: The engine computer has seen coolant temperature go above its safe limit, meaning the engine is overheating or the temperature sensor is reading as if it is.
Safe to drive? No. Pull over and shut the engine off. Driving an overheating engine can warp the cylinder head and ruin the head gasket or engine.
Common symptoms
- Temperature gauge high or in the red
- Coolant boiling over or pushing out of the overflow tank
- Steam from under the hood
- Engine power reduced to protect itself (some cars)
Likely causes, ranked
- Low coolant from a leakDIY
- Thermostat stuck closedShop
- Cooling fan not runningShop
- Water pump or clogged radiatorShop
- Failed head gasketShop
- Faulty coolant temperature sensor or wiringShop
Vehicle-specific notes
- 2015–2020 Lincoln MKZ: Ford bulletin 19-2346 lists P0217, P1285 and P1299 alongside misfire codes for coolant leaking into the cylinders on certain 2017–2019 MKZ 2.0L EcoBoost engines. Read the full answer · Source
- 2003–2006 Subaru Baja: Owners chasing overheating on the Baja found causes ranging from the thermostat and fans to a failed head gasket confirmed by leak-down and chemical tests. Read the full answer · Source
What it means: The engine computer has seen coolant temperature go above its safe limit, meaning the engine is overheating or the temperature sensor is reading as if it is.
Severity: High. Safe to drive? No. Pull over and shut the engine off. Driving an overheating engine can warp the cylinder head and ruin the head gasket or engine.
DIY or shop?
Topping up coolant (once cool) and checking fans and the cap are DIY. Diagnosing the cause of overheating, and head gasket or water pump work, are shop jobs.
Before you replace parts
- Stop and let the engine cool before opening the coolant cap.
- Check the coolant level and look for leaks, a stuck thermostat, or cooling fans that don't run.
- Read all stored codes. Misfire codes together with overheating codes can point to coolant leaking into a cylinder.
- Check your VIN for recalls, service bulletins and extended coverage.
Safety / mechanic note
Verify with a mechanic. Overheating can destroy an engine quickly, and hot coolant can cause burns. A code points to a circuit or system, not always a specific part.