The intermediate steering shaft in your 2022 GMC Terrain connects the steering column to the steering gear. A clunking noise from this shaft is a common complaint in GM vehicles and indicates worn splines or universal joints requiring attention.
Intermediate Shaft Function
The intermediate shaft transmits your steering input from the column to the steering rack. It contains universal joints that allow for angular connection and may include a collapsible section for crash safety. The splined connections allow adjustment during assembly.
Causes of Clunking
Clunking typically results from worn splines where shaft sections connect, dry or worn universal joints, or looseness at mounting points. GM vehicles have experienced recurring issues with intermediate shaft wear in various model lines.
Sound Characteristics
The clunk usually occurs at the transition between steering left and right—a single clunk as you reverse steering direction. The sound originates from behind the firewall where the shaft passes through. It's often more noticeable at slow speeds or during parking maneuvers.
GM Technical Service Bulletins
GM has issued technical service bulletins addressing intermediate steering shaft noise in many vehicles. These often recommend shaft replacement or updated shaft designs. Check for applicable TSBs for your specific vehicle.
Repair Options
Replacement is the typical repair, though some shops have had success with lubrication or shimming for minor wear. The updated shaft designs often provide better long-term durability than simply replacing with the same original part.
Code C0073 Context
Code C0073 relates to vehicle speed signal issues that may accompany steering concerns. While not directly a shaft code, mechanical steering problems may trigger related system faults.