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April 26, 2016 Service bulletin

39370 ? Service Update Bulletin

GMC technical service bulletin 39370 for 2016 GMC Sierra 1500 and 2016 Chevrolet Silverado 2500.

Bulletin number
39370
Component
Power train: automatic transmission
Summary
39370 ? Service Update Bulletin. On vehicles equipped with an 8-speed automatic transmission, the C-1-3-5-6-7 piston assembly internal to the transmission may be out of specification resulting in potential shift quality and long term durability issues. Dealers are to replace the transmission.

Owners of these vehicles have filed 103 complaints in the transmission category.

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