Yes, both up and down stream of where you see an issue is important.
Lateral pelvic tilt can lead to neck and upper back pain because a tilt disrupts the muscle balance in our body and can cause posture problems and back pain.

In hip raised above neutral the quadratus lumborum and adductor muscles become tight.

Identifying the cause of the lateral pelvic tilt is key so that can be corrected.
Addressing posture and gait (walking pattern). Paying attention to spine position when sitting and standing helps the new positioning become your normal positioning.
Learning to distribute your weight evenly across the both sides of your body while keeping your pelvis in neutral position.

A few episodes to start addressing the lateral tilt.
The QL Is NOT a Bone…Even in THE Matt Chan
Episode 233: The Ball and Your Back + Space Mountain MWod Part 1
Thursday November 3rd, 2016 High Glutes and QL
Thursday December 8, 2016 Gut Smash and QL
Wednesday January 4, 2017 T-spine and QL

Episode 142: Tight IT Band and Hip Flexor Fix: Runners?
Couch Stretch, Tight Hips & Don’t Go In the Pain Cave | Mobility Project Episode 2
lower back

Strengthen the hip abductors