Service bulletin LI46.00-P-079786

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

Complaint Noise from front end thought to be from steering gear. Cause During diagnostics of a front end noise, workshop is under the impression the noise is coming from the steering gear. Remedy If the root cause of the noise cannot be found and is seemingly from the steering rack, perform the below LI's and diagnostics. If they have been performed and the root cause still cannot be determined, a TIPS case must be opened to the Body/Chassis/Entertainment team prior to replacing the steering rack. • LI46.35‑P‑067339 ‑ "Rattling, Humming, Dry Sliding/Gravel Noise When Steering" • LI46.35‑P‑071461 ‑ "Check Tie Rod Outer Joint of Steering Gear" • LI46.10‑P‑077391 ‑ "Knocking Noise In The Area Of The Steering Gear or Steering Column Tube When Braking Or Moving Off; The Steering Wheel Can Also Be Felt To "Crack"" • Remove boot clamps closest to steering gear housing on both left and right (as seen in "Steering Rack Boot Clamp Location"). Pull back boot and inspect for rust, broken end stops, water, or any other anomalies. Keep the boot clamps in case the rack is returned. • If the noise is described as "clacking" or "knocking" when moving the wheel back and forth in quick oscillations and the thrust element in the steering rack has NOT been checked yet, please perform a check and subsequent adjustment, if necessary, as detailed in AR46.20‑P‑0601ME. • Remove sway bar links and see if noise persists. • Perform NVH time‑domain noise diagnosis pointing to the steering rack as the root cause. The TIPS case must contain the following: • Video underneath the vehicle with clearly audible noise while engine is running. • Video inside the vehicle with clearly audible noise while engine is running. • Vehicle checked for history of collisions. • Vehicle history checked for other noise complaints in the area. • List of other checked components (suspension, drive line components, wheel bearings, etc...). • Along with the audible noise, does the feel/noise change through only a certain part of the steering arc sweep? • Provide the thrust element before and after readings.

The document

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Components

Steering

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