Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Check for any of the following conditions:
- A DTC P0125 can indicate a skewed ECT sensor. Comparing the coolant temperature displayed on a scan tool with the actual engine coolant temperature measured with a thermometer may isolate the fault. If the displayed engine coolant temperature is not close to the actual engine coolant temperature, replace the ECT sensor. Refer to Temperature Versus Resistance - Engine Coolant Temperature Sensor .
- Check for the proper operation of the thermostat. Refer to THERMOSTAT DIAGNOSIS .
- An intermittent malfunction may be caused by a fault in the ECT sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions .
- If the DTC P0125 cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.