Step back to a 2008 it is TSB #08-06-01-012B and covers the VINs N, K, R, W, 1, 3 - RPOs LZ4, LZE, LZ8, LGD, LZ9, LZG. The 2009 Uplander was a Canada only so it might cover it.

Looking at the TSB it still hasn't gotten fixed. Use bolt #11569649 in all 10 po... Login to read more.