Cobalt L4-2.2L (2008)
1. Check for the possibility of the PCM and the TCM rattling/clunking together. If there is contact between these two modules, insulate the modules
from each other using a small piece of foam.
2. Check that the retaining clip on the engine coolant surge tank is fully seated. If not, push down to seat.
Rattles/clunks in this area of the engine compartment may be heard as coming from the steering column while driving.
If this does not eliminate the noise, continue to diagnose the vehicle according to the diagnostics in SI.
Warranty Information #5
Condition #6 (FE1 Suspension Only)
Some customers may comment on a clunk, thump or rattle noise coming from the front suspension while driving over rough road conditions or when
braking.
Cause #6
This condition may be caused by the lower control arm rubber bushing (rear) coming out of its steel sleeve (1). This will cause the lower control arm to
make hard contact (2) with the body structure. This condition may be more prevalent in regions that use road salt during the winter months.
Correction #6
If the rubber bushing has moved out of the steel sleeve, replace the lower control arm bushing. Do not replace the bushing if it is still centered in the steel
sleeve.