Diagnostic Aids
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- After starting a cold engine, the following scan tool parameter value should rise steadily and then stabilize: ECT Sensor
- High resistance in either the IAT sensor signal or low reference circuit may cause a DTC to set.