NHTSA ID Number: 10198840
Manufacturer Communication Number: 18NA091
Summary
This technical bulletin provides a procedure for software update and transmission flush to correct a slight shutter felt during gear shift.
2 Affected Products
Vehicles
Condition
Some customers may comment on a slight shudder felt during gear shift at slow speeds below 64 km/h (40 mp/h) with light throttle application.
Cause
This condition may be caused by possible torque converter clutch (TCC) shudder on reapply after a shift.
Correction
If confirmed to be a TCC shudder while monitoring TCC slip speed during the concern, or the concern goes away when TCC is commanded on with the scan tool and the concern is present at 64 km/h (40 mp/h) or below during the gear shift, reprogram the Transmission Control Module (TCM) with the latest calibrations including following the procedure in SI that requires to perform Service Fast Learn (SFL) after programming TCM. Also, drain and refill the transmission using DEXRON VI as per SI.
Important: A minimum of 200 miles (322 km) needs to be driven after the drain and fill to confirm the repair.
Note: If the shudder occurs above 64 km/h (40 mp/h) or with the TCC commanded on TSB 17-NA-317 should be reviewed.
SEOCONTENT-START
Service Bulletin Bulletin No.: 18-NA-091 Date: May, 2021 TECHNICAL Subject: Slight Shudder Felt During Gear Shift at Slow Speeds Below 64 km/h (40 mp/h) with Light Throttle Application This bulletin replaces PIP5546C and it should be discarded. Brand: Model: Model Year: Breakpoint: Engine: Transmission: from to from to Buick
Enclave 2018 2018 SOP EOP – Equipped with TRANSMISSIONAUTO 9 SPD, 9T65, GEN (RPOs M3W, M3V) Chevrolet Traverse Involved Region or Country North America, Russia, Middle East, Israel, Palestine, Chile, Columbia, Peru and Africa. Condition Some customers may comment on a slight shudder felt during gear shift at slow speeds below 64 km/h (40 mp/h) with light throttle application. Cause This condition may be caused by possible torque converter clutch (TCC) shudder on reapply after a shift. Correction If confirmed to be a TCC shudder while monitoring TCC slip speed during the concern, or the concern goes away when TCC is commanded on with the scan tool and the concern is present at 64 km/h (40 mp/h) or below during the gear shift, reprogram the Transmission Control Module (TCM) with the latest calibrations including following the procedure in SI that requires to perform Service Fast Learn (SFL) after programming TCM. Also, drain and refill the transmission using DEXRON VI as per SI. Important: A minimum of 200 miles (322 km) needs to be driven after the drain and fill to confirm the repair. Note: If the shudder occurs above 64 km/h (40 mp/h) or with the TCC commanded on TSB 17-NA-317 should be reviewed. Service Procedure Refer to Transmission Control Module: Programming and Setup and Transmission Fluid Drain and Fill in SI. 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 8480738* Update TCM with the Latest Software and Flush and Fill the Transmission Fluid 1.3 hrs. *This is a unique Labor Operation for Bulletin use only. Page 2 May, 2021 Bulletin No.: 18-NA-091 Version 4 Modified Released March 23, 2018 Revised July 17, 2018 – Updated the Breakpoint and Correction Revised August 09, 2018 – Updated the Breakpoint. Revised May 24, 2021 – Updated the Warranty Information.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 18-NA-091
Date: May, 2021
MC-10198840-9999.pdf 499.364KB
NHTSA ID Number: 10187432
Manufacturer Communication Number: 18NA091
Summary
This informational bulletin provides information for software update and transmission flush to correct a slight shutter felt during gear shift.
1 Associated Document
Manufacturer Communications
Bulletin No.: 18-NA-091
Date: August, 2018
MC-10187432-9999.pdf 498.881KB
NHTSA ID Number: 10129871
Manufacturer Communication Number: PIP5546C
Summary
This Preliminary information communicates if a slight shudder is felt during a shift at speeds of 40 MPH or below to perform a transmission fluid drain and fill.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5546C
Published date: 02/8/2018
NHTSA ID Number: 10129861
Manufacturer Communication Number: PIP5546B
Summary
This Preliminary information communicates if a slight shudder is felt during a shift at speeds of 40 MPH or below to perform a transmission fluid drain and fill.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5546B
Published date: N/A
NHTSA ID Number: 10129096
Manufacturer Communication Number: PIP5546A
Summary
This Preliminary information communicates if a slight shudder is felt during a shift at speeds of 40 MPH or below to perform a trans fluid drain and fill and to perform a cooler flow test to flush the cooler.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5546A
Published date: N/A
NHTSA ID Number: 10129079
Manufacturer Communication Number: PIP5546
Summary
This Preliminary information communicates if a slight shudder is felt during a shift at speeds of 40 MPH or below to perform a trans fluid drain and fill and to perform a cooler flow test to flush the cooler.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5546
Published date: N/A
Reprogramming
GM Diagnostic/Programming (TIS2Web)
Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle's 17 character Vehicle Identification Number (VIN) and select 'Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.
The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
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