NHTSA ID Number: 10116600
Manufacturer Communication Number: 16-NA-175
TSB/Document Date: 2017-08-31
Summary
This technical bulletin provides a procedure to flush and drain fluids for the transmission to eliminate a shake and/or shudder during a light throttle acceleration between 48 and 104 KM/H (30 and 65 MPH) at a steady state.
11001500
42-55
150300
26
CT6
6 CYL. NA
LGX
M5N
8
V6
11001500
42-55
100250
23
CT6
4 CYL.
Turbo
LTG
M5N
8
NA
11001500
42-55
100250
23
Camaro
6 CYL. NA
LGX
M5T
8
V4/V6
11001500
42-55
100250
23
Camaro
4 CYL.
Turbo
LTG
M5T
8
V4
11001500
42-55
100250
23
Chevrolet
Camaro
8 CYL. NA
LT1
M5U
8
V4/V8
10001,500
40-55
100200
/175375
28
2
Chevrolet
Corvette
8 CYL. NA
LT1
M5U
8
V4
(Eco
Drivin
g
Mode)
10001800
40-80
125250
28
Corvette Z06
8 CYL.
Superchar
ged
LT4
M5U
8
V4
(Eco
Drivin
g
Mode)
10001800
40-80
125250
28
Silverado/Sierra
8 CYL. NA
L83
M5U
8
V8
10501500
45-55
200375
26
Silverado/Sierra
8 CYL. NA
BAS
L8B
M5X
8
V8
10501500
45-55
200375
26
Chevrolet/GMC
/C
adillac
Silverado/Sierra/Y
ukon
Denali/Denali
XL/Escalade/ESV
8 CYL. NA
L86
M5U
8
V8
10501500
45-55
200375
26
*
To confirm TCC shudder, the vibration concern must be created in normal operation (Mode A) of the test. If the concern is gone with the torque converter
clutch disabled (Mode B, TCC Open) and is gone when the torque converter clutch enabled (Mode C, TCC Locked), the vibration root cause is TCC
shudder and the fluid flush procedure corrective action described below should be performed.
If the concern is not present in Mode A, then the vibration concern is not TCC shudder. If the concern is still present with the torque converter clutch disabled
(Mode B) or with the torque converter clutch enabled (Mode C, TCC slip speed at zero), the root cause of vibration is NOT shudder. Vibrations not identified as
shudder should be further investigated using the “Vehicle Vibration Diagnosis in SI as a starting point.
The use of the PICO scope and NVH software can be used to confirm TCC shudder, Engine, Tire or Driveline component related conditions.
To confirm TCC shudder record the PICO scope data while driving in 8th gear in the application specific condition above. Minimize extraneous
vibration input by testing on a smooth road and correct any other known vehicle vibration issues (tires, brakes, etc.) before conducting test. If
TCC Shudder is present, a vibration peak will appear (highlighted by arrow below) within +/-2 Hz of the frequency listed in the table above. TCC
Shudder vibration frequency should remain constant in 8th gear as indicated in the above table. If the vibration frequency follows vehicle speed
or engine speed, then it is NOT TCC Shudder.
In the above illustration, frequency and default view have been selected.
Service Procedure
Important: Requires Mobil 1 Synthetic LV ATF DEXRON HP (GM Part No. 19353429, in Canada 19353430).
3
Note: U.S. dealers must order the Mobil 1 Synthetic LV ATF DEXRON HP fluid through your local General Motors oil distributor. Canadian dealer must order
through CCA.
Step 1: Cooler Flush, Drain, Clean pan/magnet, Replace Filter (If needed), Oil Fill, & Circulate New Fluid
Note: The Transmission Fluid Cooler Flow Test and Flushing procedure can be located by building the vehicle in SI, select Transmission, Transmission
Cooling, Diagnostic Information and Procedures. Select the appropriate transmission.
1 a.) Flush the cooler lines and cooler, refer to SI for proper procedure.
Note: DEXRON VI transmission fluid may be used to flow and flush the transmission cooling system. Compressed air should be used to remove any residual
fluid from transmission cooler lines.
1 b.) Remove the transmission fluid pan and drain transmission fluid following SI procedures for the application you’re working on. Discard all oil.
Note: If you find that the fluid is cloudy, milky, or appears to be contaminated with water or engine coolant, DO NOT proceed with below steps. Follow Both SI
Procedures for “Cooling System Leak Testing (L83, L86)” and “Engine Coolant/Water in Transmission.”
1 c.) Clean the pan/magnet if any metallic particles present and replace transmission filter if debris is found.
1 d.) Install the transmission fluid pan and refill with new transmission fluid using enough volume to have oil come out of oil level check plug.
Important: Operate the vehicle on the hoist for 10 minutes. Cycle through all forward gear ranges, Reverse and Neutral.
Step 2: Drain, Oil Fill, & Circulate New Fluid
2 a.) Remove the transmission fluid pan and drain transmission fluid again. Discard all oil.
2 b.) Install the transmission fluid pan and refill with new transmission fluid using enough volume to have oil come out of oil level check plug.
Important: Operate the vehicle on the hoist for 10 minutes. Cycle through all forward gear ranges, Reverse and Neutral.
Step 3: Drain, Oil level Set, and Drive to Evaluate
3 a.) Remove the transmission fluid pan and drain transmission fluid again. Discard all oil.
3 b.) Install the transmission fluid pan and refill with new transmission fluid following the “Fluid Fill Procedure” in SI to obtain correct fluid level.
The shudder should be improved after the completion of this triple flush procedure.
Note: Shudder should improve directionally right away, but for full affect the vehicle may need to be driven up to 200 miles (322 km). and at least two cold to hot
drive cycles before determining if the fluid flush corrected the condition or not. Do not re-evaluate vehicle for additional customer shudder concerns until the
vehicle has been driven 200 miles (322 km).
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
Description
Labor Time
8480478*
Flush and Drain Fluids for Transmission Shake and/or Shutter Repair
Use Actual Clock Time
*This is a unique Labor Operation for Bulletin use only.
Version
4
Modified
June 01, 2016 – Added a breakpoint date.
Nov. 29, 2016 – Added the 2017 Model Year and updated information including graphics under Diagnosis
Instructions.
Feb. 27, 2017 - Updated the Model section and added additional information to Test 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.
4
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TSB/Document ID: 16-NA-175
Replacement Service Bulletin Number:
MFR Communication Date: 2017-02-27
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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