Circuit/System Testing: P0117
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, engine OFF, disconnect the ECT sensor and observe the ECT parameter for -38°C (-36°F).
- If over -38°C (-36°F), test the signal circuit of the ECT sensor for a short to ground, or a short to any low reference circuit. If the ECT circuit test OK, then replace the ECT sensor.
- If under -38°C (-36°F), test for an intermittent and for a poor connection at the ECT sensor. If the ECT circuit tests OK, then replace the control module.