PIP3366C
Service Bulletin Details
Public Details for: PIP3366C
This preliminary information communicates to the dealer technician thatlight duty trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmiss
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Bulletin No.: PIP3366C Published date: 07/9/2018 Preliminary Information PIP3366C Grind/Ratchet Noise Occurs When Shifting Into Park While In 4 Wheel Drive Low Models Brand: Model: Model Years: VIN: from to Engine: Transmissions: Cadillac Escalade 1999 - 2019 All All All All Chevrolet Avalanche 2002 - 2013 All All All All Chevrolet Blazer 1999 - 2005 All All All All Chevrolet Colorado 2004 - 2012 All All All All Chevrolet Colorado 2015 - 2019 All All All All Chevrolet S-10 1999 - 2004 All All All All Chevrolet Silverado 1999 - 2019 All All All All Chevrolet Suburban 2002 - 2019 All All All All Chevrolet Tahoe 2002 - 2019 All All All All Chevrolet Trailblazer 2002 - 2007 All All All All GMC Canyon 2004 - 2012 All All All All GMC Canyon 2015 - 2019 All All All All GMC Envoy 2002 - 2009 All All All All GMC Jimmy 1999 - 2005 All All All All GMC Sierra 1999 - 2019 All All All All GMC Sonoma 1999 - 2004 All All All All GMC Yukon Models 1999 - 2019 All All All All Hummer H2 2003 - 2010 All All All All Hummer H3 2006 - 2010 All All All All Supersession Statement This PI was superseded to update Model Years. Please discard PIP3366B. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition / Concern Light Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of a grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low (4LO) range. Recommendations / Instructions When in 4LO there is a greater amount of gear reduction through the transfer case into the driveline than when the transfer case is in 2WD or 4WD High. When the automatic transmission is shifted from drive or reverse into park with the transfer case in 4LO the driveline unloads and turns the propeller shaft approximately 1/8 of turn. This approximate 1/8 turn of rotation will travel into the transfer case through the gear reduction of 4LO and into the transmission. The gear reduction in the transfer case causes the transmission output shaft to turn at a greater speed than the automatic transmission parking pawl will hold. This will result in the parking pawl to grind/ratchet until the output shaft comes to a stop. The grind/ratchet noise will last approximately one second. This condition should be considered characteristic of 4 wheel drive vehicles operated in 4LO. Replacing transmission, transfer case and or driveline components will not resolve the concern. It is recommended to shift into park while the transfer case is in the 4HI or 2HI range. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. © 2018 General Motors. All Rights Reserved.