NHTSA ID Number: 10143757
Manufacturer Communication Number: PIP3366C
TSB/Document Date: 2018-08-20
Summary
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 transmission into park while the transfer case is in 4 wheel drive low (4LO) range. Dealers technician's are advised this condition should be deemed a normal characteristic of 4WD low operation.
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:
Escalade
1999 - 2019
All
All
All
All
Avalanche
2002 - 2013
All
All
All
All
Blazer
1999 - 2005
All
All
All
All
Colorado
2004 - 2012
All
All
All
All
Colorado
2015 - 2019
All
All
All
All
S-10
1999 - 2004
All
All
All
All
Silverado
1999 - 2019
All
All
All
All
Suburban
2002 - 2019
All
All
All
All
Tahoe
2002 - 2019
All
All
All
All
Trailblazer
2002 - 2007
All
All
All
All
Canyon
2004 - 2012
All
All
All
All
Canyon
2015 - 2019
All
All
All
All
Envoy
2002 - 2009
All
All
All
All
Jimmy
1999 - 2005
All
All
All
All
Sierra
1999 - 2019
All
All
All
All
Sonoma
1999 - 2004
All
All
All
All
Yukon Models
1999 - 2019
All
All
All
All
H2
2003 - 2010
All
All
All
All
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This PI was superseded to update Model Years.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.
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TSB/Document ID: PIP3366C
Replacement Service Bulletin Number:
MFR Communication Date: 2018-07-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN:AUTOMATIC TRANSMISSION
MFR Component System:
MFR Component Subsystem:
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