GENERAL MOTORS issued a rcall on the SIERRA, and SILVERADO models

On certain vehicles, the Sensing and Diagnostic Module (SDM) may corrode due to a significant quantity of snow and/or water containing road salt or other contaminants entering the vehicle and saturating the acoustical padding beneath the floor carpet. If sufficient moisture collects and is retained in the padding, it may cause excessive corrosion under the module; compromising the module seal and allowing water intrusion and system malfunction. This may result in illumination of the Airbag Readiness light along with a "Service Airbag" message on the Driver Information Center and, in certain instances, may cause inadvertent deployment of the seatbelt pretensioner and/or airbags. Inadvertent airbag and/or pretensioner deployment could result in injury and/or damage to property. Correction: Dealers will remove the acoustical pad above the SDM, inspect, and if necessary, replace the SDM. Note: This is an expansion of recall 2009-291