19NA153

Bulletin No.:
Service Bulletin
Date:
19-NA-153
December, 2020
TECHNICAL
Subject:
Brand:
Malfunction Indicator Lamp (MIL) Illuminated - DTC P0741 Set
Model:
Colorado
Express
Chevrolet
Silverado
Silverado LD
Suburban
Tahoe
Canyon
Savana
GMC
Sierra
Model Year:
from
2016
2014
VIN:
to
from
to
Engine:
Transmission:
2019
2018
2019
2014
2016
2014
Sierra
Limited
2019
Yukon
2014
2019
MYB,
MYC, MYD
2019
2018
2019
Involved Region or Country
North America
Condition
Some customers may comment that the MIL is Illuminated.
Some technicians may find DTC P0741 (Torque Converter Clutch (TCC) System Stuck
Off) set as an active or history code.
Cause 1
5448383
This condition may be caused by a damaged turbine shaft front bushing (218) in vehicles
with mileage less than 10,000 miles (approx. 16,000 km).
⇒ The turbine shaft may also be damaged in the journal area that is in contact
with this bushing.
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
Cause 2
December, 2020
Bulletin No.: 19-NA-153
This condition may be caused by a damaged clutch friction material in the torque
converter in vehicles with mileage above 30,000 miles (approx. 48,000 km).
Perform a line pressure check.
⇒ If the line pressure is low, check the trans pump for damage and refer to the
latest version of PI1447.
Correction
1. Connect GDS to the vehicle for a road test.
2. Select TCM and navigate to the TCC dynamic test screen.
3. Drive the vehicle at approximately 10 mph (16 km/h) and command the TCC on and
off several times. Note if the TCC engages;
⇒ Should feel TCC engagement and see tachometer drop.
⇒ TCC slip speed will drop to near zero.
• If TCC does not engage, refer to SI for P0741 to test for circuit/electrical problem and/
or sticking TCC apply valve.
• If the TCC does engage, refer to the Service Procedure below.
Service Procedure
1. Replace the torque converter. Refer to Torque
Converter Replacement in SI.
5360222
5360216
2. Remove the transmission oil pan.
3. Inspect the magnet in the pan for excessive metal
accumulation.
• If there was no signs of metal in the oil pan,
install the pan and no further work is required.
• If there was excessive metal shaving in the oil
pan magnet, Install new filter when
reassembling and continue to step 4.
4. Remove the upper and lower valve body and clean
thoroughly.
5. Inspect the TEHCM solenoid screen for debris:
• If there was no signs of metal in the TEHCM,
install the pan and no further work is required.
• If there was excessive debris in the TEHCM,
replace the TEHCM/solenoid valve body Only if
there is debris on the screen as shown above
and continue
Bulletin No.: 19-NA-153
December, 2020
Page 3
5360776
Do Not replace the pump if no signs of damage or
excessive wear was not validated during inspection as
shown above.
5360218
Note: Refer to the latest version of PI1447 for possible
bushing/shaft scoring. Replace parts as necessary.
Causal
Part
Description
N/A
ROTOR PKG, A/
TRNS
FLUID PUMP
Parts Information
N/A
Note: Only select the parts that coincide with the repair
performed.
VALVE,
CONT SOL
N/A
HOUSING, T/CV
N/A
FILTER KIT, A/
TRNS FLUID
N/A
Fluid,
Transmission
(DEXRON®VI)
Description
X
CONVERTER,
TORQ
N/A
Part
Number
Refer
to EPC
Qty
1
Qty
COVER, A/TRNS
FLUID PUMP
Perform an inspection of the transmission pump for
signs of excessive wear as shown above.
Replace pump components as necessary.
Causal
Part
Part
Number
88865601
(U.S.)
19420142
(Canada)
6-12.4 qts
(5.7-11.7
liters)
Page 4
December, 2020
Bulletin No.: 19-NA-153
Warranty Information
Note: Only select the labor operation number that
coincide with the repair performed.
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
Vehicle
Labor Time
8480848*
Diagnostic Test
All
0.5 hr
Add
Transmission Line
Pressure Test
All
Add
Silverado
Add
Sierra
Add
Colorado
Add
Canyon
Add
Add
Torque Converter
Replacement
Add
Colorado
Canyon
Suburban
0.5 hr
3.8 hrs (2WD)
5.1 hrs (4WD)
LFX
6.3 hrs (2WD)
7.6 hrs (4WD)
LWN
6.6 hrs (2WD)
11.9 hrs (4WD)
4.2 hrs (2WD)
5.1 hrs (4WD)
Add
Yukon
Add
Express
Add
Savana
4.2 hrs (2WD)
4.7 hrs (4WD)
0.7 hr
Add
Pump Inspection
All
Add
TEHCM Inspection and
Cleaning
All
1.0 hr
Version
5
Modified
Released July 11, 2019
Revised August 07, 2019 - Add Utility models to the Model section.
Revised November 26, 2019 - Added Cause 1 section.
Revised May 04, 2020 - Removed LTG time to combine all time under Bulletin Only labor
time and removed the T1 truck information.
Revised December 03, 2020 - Increased Mileage in the Cause 1 section, Add Replace
Fluid Filter in Step 3 and Add Fluid Filter to Parts Information section.
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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