Powertrain, generic · Fuel and air metering (injector circuit)

P0217 Engine Coolant Over Temperature Condition

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P0217 is a condition code: the engine module reports that coolant temperature has passed a protection threshold. The limit and the reaction depend on the manufacturer – Saab's 2.2 diesel sets it at 120 °C for over 10 s, limits fuel quantity and suspends EGR and boost diagnostics until the temperature drops; heavy-duty diesels cut power sharply and may shut down; Ford petrol engines use their own code P1299 and cut fuel to individual cylinders. Whether the warning light comes on varies, because CARB exempts overheat protection that only engages once the gauge reads red. Usual causes are low coolant, a thermostat stuck closed, a failed fan or water pump – but Ford traced some cases to a faulty coolant sensor or harness.

Likely causes

Low coolant (leak, head gasket)
Thermostat stuck closed
Radiator fan, fan clutch or water pump faulty, radiator clogged
Coolant temperature sensor or harness faulty (false reading)
Extreme load (towing, gradient, heat) with an intact cooling system

Symptoms

  • Temperature gauge in the red, overheat warning
  • Loss of power, limp mode, cylinders possibly shut off
  • Air conditioning switches off
  • Steam or coolant smell, coolant loss

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–900
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Stop the engine and let it cool before opening the cooling system
  2. Check coolant level and leaks
  3. Check fan operation

Parts involved

cooling systemthermostatengine coolant temperature sensorradiator fan

Related codes

P0116P0117P0118P0128P0480

References: law.cornell.edu, saabwisonline.com, static.nhtsa.gov, static.nhtsa.gov.