Chevrolet Cobalt 2003–2007 — technical service bulletin
Bulletin 070729001 · NHTSA communication 10021453 · issued Apr 1, 2007
Technical service bulletin
communication type
Power Train
component
2003–2007
model years
16
vehicle entries
Official summary
Mg3, m86 transaxle grinding/whining noise in 3rd or 4th gear, excessive engagement or disengagement effort while shifting into 3rd or 4th gear, will not shift into either 3rd or 4th gear. (replace complete output shaft assembly). *kb
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.