Steering Column Rattle or Knocking Noise at Low Speeds (Bulletin Canceled - See Bulletin 04-03-08-006B)

This bulletin is being canceled and replaced by Corporate Bulletin 04-03-08-006B. Please discard Corporate Bulletin Number 07-02-35-004 (Section 02 -- Steering).

Some customers may comment on a rattle or knocking noise that is heard in the front of the vehicle while driving at low speeds (5-15 mph or 8-24 km/h). This condition may be more noticeable while making a slow turn, or on a loose/rough surface.

This condition can be duplicated by the technician using the following procedure:

1. On a rough or loose surface (i.e., gravel parking lot), make a sweeping turn (either direction) at 5-15 mph (8-24 km/h) to load the steering column, I-shaft and steering rack/gear mechanisms (The testing on a rough or loose surface will allow the wheels to oscillate slightly and will make the rattle/knocking noise more evident and repeatable).
2. Release the steering wheel, while making the turn, to take load off of steering components. This should initiate the rattle/shudder noise, which is generated by backlash in the steering assembly as it is in a no load float condition.



3. Remove the 60 amp EPS fuse (1) in the underhood fuse block.
4. Test the vehicle as in Step 1. Since the EPS motor is no longer powered, only the I-shaft and steering gear/rack will be loaded as you make the turn. If you hear the rattle/knocking noise during the turn, then the noise is being generated by the backlash within the steering column (assist motor gear mechanism).
5. Replace the 60 amp EPS fuse and repeat Steps 1 & 2 to verify that the rattle/knocking noise disappears when turning (loading steering mechanism) and can only be heard when releasing the steering wheel.

Please refer to Corporate Bulletin Number 04-03-08-006B.