Constant Noise

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
NOTE: Inspect for the proper gear oil levels prior to performing system diagnosis. Refer to Front Axle Lubricant Level Inspection
Low gear oil levels	Faulty oil seals or other type leaks may contribute to lower than required fluid levels. Refer to Front Axle Lubricant Leak Diagnosis . Fill to the proper level with the correct gear oil. Refer to Adhesives, Fluids, Lubricants, and Sealers , and Front Axle Lubricant Level Inspection .
Bearing noise within the differential assembly	A grinding or roar type noise will increase or decrease relative to the vehicle speed. Check for the proper fluid level. Fill as required. If the noise continues, replace the carrier unit. Refer to Front Differential Carrier Assembly Replacement (LGX or LF4) Front Differential Carrier Assembly Replacement (LCV or LTG) .
Gear set whine noise within the differential assembly	A whine type noise will increase or decrease relative to the vehicle speed, approximately 31-37 km/h (50-60 mph). Typical causes of a gear set whine type noise may include incorrect backlash and/or pinion depth adjustment or worn or scored gear set teeth. Check for the proper fluid level. Fill as required. Replace the carrier unit. Refer to Front Differential Carrier Assembly Replacement (LGX or LF4) Front Differential Carrier Assembly Replacement (LCV or LTG) .