One problem related to service engine light on has been reported for the 2009 Chevrolet Traverse. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Traverse based on all problems reported for the 2009 Traverse.
My 09' Traverse started to shudder intermittently on acceleration and then the service engine light (sel) came on. I had the car diagnosed and the code was a p0302 (misfire cyl). I had the car serviced and repaired by an ase certified mechanic. All coils and spark plugs were replaced along with fuel inj service, performance restore (oil, gaskets, etc). No discrepancies were noted with previous coils/plugs. The car appeared to be fixed. No problems were noted during an 800 mile roundtrip. Then the shuddering returned during normal day driving around town upon acceleration with the sel illuminating. I took the car back into the mechanic, and the code was the same (p0302). After further research by the mechanic, a gm technical bulletin was found (#pip5038b). I've contacted gm customer service and filed a complaint, case # 9-5063655170.