Buick LaCrosse Drivetrain and Transfer Case Warning Signs You Should Not Ignore

Most drivetrain and transfer case problems announce themselves well before they strand anybody. On a 2017-2019 LaCrosse, these are the ones worth acting on.

1. A four wheel drive light that flashes and never engages

This is the symptom people put off longest and regret most. Start by looking at transfer case encoder motors.

2. A hum that changes with steering input, which usually points at a wheel bearing

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at transfer case encoder motors.

3. Vibration that appears above 55 mph and grows with speed

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at u-joints.

4. A clunk on the transition from drive to reverse

This is the symptom people put off longest and regret most. Start by looking at front differential actuators.

What to Do Next

Transfer case and differential fluid on a schedule that tightens sharply if you tow or run in dust. Wheel bearings are replaced on noise, not on mileage.

Ride height, axle ratio and locking differential content all change these numbers.

We stock genuine GM parts for every nameplate on this list and ship nationwide from Dallas. Start at our Buick OEM parts catalog, or search for LaCrosse transfer case encoder motors if you already know what you need.