Grind/Ratchet Noise Occurs When Shifting Into Park While In 4 Wheel Drive Low – 1999-2019 Cadillac Chevrolet GMC Hummer

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: Engine: Transmissions:
from to
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This PI was superseded to update Model Years.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.


Bulletin No.: PIP3366C
Published date: 07/9/2018

https://www.nhtsa.gov/recalls?nhtsaId=10143757

https://static.nhtsa.gov/odi/tsbs/2018/MC-10143757-9999.pdf

Download (PDF, 74KB)


 

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Last update on 2019-03-18 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2019-03-18 / Affiliate links / Images from Amazon Product Advertising API

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