19NA035

Service Bulletin
Bulletin No.:
19-NA-035
Date:
April, 2020
TECHNICAL
Subject:
8L45, 8L90 Park System Does Not Engage
This Bulletin replaces PIP5526A. Please discard PIP5526A.
Model Year:
Brand:
Cadillac
Chevrolet
Model:
from
VIN:
to
ATS
2016
2019
CT6
2016
2018
CTS
2016
2019
Escalade
Models
2015
2017
Camaro
2016
Colorado
2016
Corvette
2015
Express
2017
Silverado
Models
2015
2018
2019
2019
Silverado
1500 (New
Model)
from
to
Engine:
Transmission:
(8L45, 8L90
Automatic)
M5U, M5X,
M5T,
M5N, MQE
2019
M5T, M5U,
M5X, MQE
Silverado LD
GMC
Canyon
2016
Savana
2017
Sierra
Models
2015
2018
2019
2019
2015
2017
Sierra 1500
(New Model)
Sierra
Limited
Yukon
Models
Copyright 2020 General Motors LLC. All Rights Reserved.
2019
M5U, M5T,
M5X, MQE
M5U
Page 2
April, 2020
Bulletin No.: 19-NA-035
Involved Region or Country
North America and N.A. Export Regions
Condition
Some customers may comment that the vehicle will not obtain Park at times.
This condition may be caused by a damaged parking pawl and/or parking pawl actuator.
Cause
⇒ The transmission may have experienced a park engagement while the
vehicle was in motion or the transfer case obtained a neutral state.
If you encounter a vehicle with the above concern, perform the following checks:
1. Attempt to duplicate the No Park condition by operating the shift lever.
⇒ The shift lever should move freely through all positions.
2. Check the transfer case for proper operation in each range.
3. Inspect the shift cable system and mounting bracket for any signs of visible damage
or being mis-routed.
⇒ If all the above are OK, continue with procedure.
4. Remove the transmission oil pan and valve body following Service Information (SI).
5. Remove the park pawl actuator bracket and discard the bolts.
6. Remove the park pawl actuator.
Correction
5247414
7. Inspect for damage, bent rod or incomplete travel of the actuator.
Bulletin No.: 19-NA-035
April, 2020
Page 3
5247435
8. Inspect the park pawl for damage.
⇒ If damage to the Park Pawl Actuator and Park Pawl is present as described
above, replace the following components:
Note: Failure to replace any of the following components may not resolve the condition
of not obtaining Park.
•
•
•
•
•
•
Park Pawl Actuator
Park Pawl
Main Shaft Detent Lever Hub Pin
Park Pawl Actuator Bracket
Park Pawl Actuator Bracket Bolts
Output Carrier
Service Procedure
Note: The transmission should be disassembled and
cleaned thoroughly.
Refer to Reaction Carrier Assembly, Output Carrier,
and Output Shaft Removal in SI.
Causal
Part
Description
N/A
BOLT, PARK
PAWL
ACTR BRKT
2
N/A
BRACKET, PARK
PAWL ACTR
1
N/A
CARRIER,
OUTPUT
1
N/A
FILTER, A/TRNS
FLUID
N/A
Oil
Parts Information
Causal
Part
Description
X
ACTUATOR,
PARK PAWL
N/A
PAWL, PARK
N/A
PIN, MAN SHFT
DTNT LVR HUB
Part
Number
Qty
1
Refer
to EPC
1
1
Part
Number
Qty
Refer
to EPC
Page 4
April, 2020
Bulletin No.: 19-NA-035
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
8466012
Description
Labor Time
Reaction Carrier Overhaul
Use
Published
Labor
Operation
Time
Version
3
Modified
Released March 14, 2019
Revised April 08, 2019 - Updated various Model Years.
Revised April 01, 2020 — Added Yukon Models.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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