Buick Verano intermittent ECT sensor circuit issue with codes P0119 and P0011 after oil change on Buick Verano

Some Buick Verano owners report experiencing intermittent issues with the Engine Coolant Temperature (ECT) sensor circuit, often accompanied by codes P0119 and P0011 appearing after an oil change. These issues may stem from an erratic ECT sensor input to the Engine Control Module (ECM), leading to unstable readings. Additionally, some owners have noted that the P0011 code, which indicates a problem with the intake camshaft position timing, can be triggered by factors such as incorrect oil viscosity or faulty camshaft timing. Potential causes include intermittent faults in the ECT sensor, wiring or connector problems, and even defective ECT sensors that provide inconsistent voltage signals to the ECM. Furthermore, some owners have found that improper oil viscosity or contamination from the oil change may impact engine performance and trigger these codes. It is recommended that affected owners conduct a thorough diagnostic check, inspect the ECT sensor for malfunctions, and verify that the correct oil type was used to effectively resolve these issues.