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September 6, 2017 Service bulletin

This informational bulletin provides information on a Service Emission System Message and/or a Malfunction...

Chevrolet technical service bulletin 16NA377 for 2017-2018 Chevrolet Silverado 1500, 2018 Chevrolet Equinox and 2017-2018 GMC Sierra 1500 and others.

Bulletin number
16NA377
Component
Engine and engine cooling: exhaust system: emission control
Summary
This informational bulletin provides information on a Service Emission System Message and/or a Malfunction Indicator Lamp illuminated. This usually occurs after recently filling the DEF tank with the ignition in the on position due to some DEF fill equipment uses pumps that create a high level of temporary aeration of the DEF fluid being dispensed in the tank.

Owners of these vehicles have filed 744 complaints in the engine category.

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