Diagnostic Aids

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes of DTC P0217:

Cooling fan(s) inoperative.
Engine cooling system overheated condition (thermostat, low engine coolant etc.).
Radiator or condenser air flow restricted.
Air dam missing or loose.
Overload due to trailer towing.
ECT sensor leaking engine coolant into ECT sensor harness connector causing elevated temperatures.
ECT sensor skewed.

The ECM will command the A/C relay Off if the temperature of the engine coolant is greater than 248°F (120°C) to protect the engine and transaxle.