The Low Oil Light may be illuminated on some 2014-2019 CTS models equipped with the 2.0L 4-cylinder engine (RPO LTG).
If the Low Oil Light is on, it may be due to the oil level sensor wiring harness clip installed incorrectly, which may cause the harness to become too long and contact the driveshaft.
Check the wiring harness at the point of contact with the driveshaft. Repair the harness if necessary and apply a double layer of Woven Polyester Electrical (PET) tape to all contact points of the harness.
Also check the positioning of the harness clip. The original routing of the harness has the clip installed from the bottom. Reposition the harness clip from the top down. (Fig. 5) Verify that there is proper clearance between the harness and the driveshaft.
Fig. 5
– Thanks to Megan Brobeck
