Harsh 5-4 Downshift and Harsh 1-2 Upshift – 2017 Chevrolet Colorado & GMC Canyon

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Copyright 2021 General Motors LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 21-NA-076
Date: November, 2021
TECHNICAL
Subject: Harsh 5-4 Downshift and Harsh 1-2 Upshift
This bulletin replaces PIP5747A. Please discard PIP5747A.
Brand: Model:
Model Year: VIN: Engine: Transmission:
from to from to
Chevrolet Colorado
2017 2017 M5T
GMC Canyon
Involved Region or Country North America
Condition
Some customers may comment that their vehicle has developed a harsh 5-4 downshift
and a harsh 1-2 upshift.
– The condition developed after approximately 25,000 miles (40,000 km). The harsh shift
conditions may only be present when the transmission temperature is above
approximately 110 F (43 C) degrees.
– The transmission may have acceptable transmission shift quality at lower operating
temperatures.
Cause This condition may be caused by the 2-3-4-6-8 Return Spring (527), has degraded
overtime contributing to the condition
Correction
Replace the 2-3-4-6-8 Piston (526) and the 2-3-4-6-8 Return Spring and reseal the 2-3-4-
6-8 and 4-5-6-7-8 Reverse Clutch Assemble following published Service Information
procedures.
Page 2 November, 2021 Bulletin No.: 21-NA-076
Service Procedure
Refer to 2-3-4-6-8 and 4-5-6-7-8 Reverse Clutch
Assembly Removal and 2-3-4-6-8 and 4-5-6-7-8
Reverse Clutch Disassemble and Assemble in SI.
Parts Information
Causal
Part
Description Part
Number
Qty
X Piston, 2-3-4-6-8
Clutch 24268881 1
X
Spring, 2-3-4-6-8
Clutch Piston
Return
24292256 1
N/A
Seal 2-3-4-6-8
Clutch Piston
Dam INNER
24250187 1
N/A
Seal, Trans Fluid
Cooler Pipe
Fitting
23135703 1
N/A Bolt, HFH Eng
Motor Bracket 11588740 3
N/A
Gasket, Exh
System Outlet
Flange
22971963 2
N/A Bolt, Transaxle
T/C 11588468 6
N/A Ring, 1-3-5-6-7
Clutch Fluid Seal 24266594 2
N/A
Gasket, A/Trans
Front Support
Cover
24284849 1
N/A Seal, A/Trans
Case Front Cover 24251906 1
N/A Seal, A/Trans
Case Front Cover 24281790 1
N/A Ring, 4-5-6-7-8
Rev Clutch Piston 24270446 1
Causal
Part
Description Part
Number
Qty
N/A Seal, 4-5-6-7-8
Rev Piston Outer 24261006 1
N/A Seal, 4-5-6-7-8
Rev Piston Inner 24250211 1
N/A
Ring, 2-3-4-6-8
Clutch Piston
Dam Retainer
24261071 1
N/A
Seal, 2-3-4-6-8
Clutch Piston
Dam OUTER
24250195 1
N/A Seal, 2-3-4-6-8
Clutch Piston 24250198 1
N/A Seal, 4-5-6-7-8
Rev Clutch Piston 24259271 1
N/A
Seal, 4-5-6-7-8
Rev Clutch
Piston Stop
24250207 1
N/A
Seal, 2-3-4-6-8
Clutch
Piston Dam
24261024 2
N/A Seal, Turbine
Shaft O-ring kit 08662686 1
N/A Bolt, A/Trans
Case Front Cover 11548201 11
N/A
Mobil 1 Synthetic
ULV HP
Fluiid (US)
19417577
As Required
N/A
Mobil 1 Synthetic
ULV HP
Fluiid (Can)
19418066
Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation Description Labor Time
8481988* 2-3-4-6-8 Piston and Return Spring Replacement 11.9 hr
Add W/4WD 2.8 hr
*This is a unique Labor Operation for Bulletin use only.
Version 3
Modified Released June 15, 2021
Revised October 27, 2021 – Increased Part 24261024 to QTYof 2 and Added Part
Number 24250187 to Parts Information section.
Revised November 05, 2021 – Update Parts Information section.

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