SB-10057635-6781

Service Bulletin

Bulletin No.: 14308A
Date: March 2015

SPECIAL COVERAGE
SUBJECT:

Special Coverage Adjustment – Transmission Oil Cooler Line Fluid Leak

MODELS:

2008 Chevrolet Silverado HD Diesel
2008 GMC Sierra HD Diesel
Equipped with Allison 6 Speed Automatic Transmission (RPO MW7)

The Part Information, Service Procedure and Warranty Transaction Information sections have been
revised. Please discard all copies of bulletin 14308.
CONDITION
Some 2008 model year Chevrolet Silverado HD and GMC Sierra HD diesel powered vehicles
equipped with a 6 speed automatic transmission (RPO MW7), may have a condition in which
increased transmission oil cooling circuit pressure may cause transmission fluid to weep or leak.
This loss of fluid occurs near the transmission cooler at the crimp joints on the metal ends of the
cooler line where it joins the rubber hose. The increased oil cooling circuit pressure is experienced
during vehicle operation at extreme low outdoor temperatures.
SPECIAL COVERAGE ADJUSTMENT
This special coverage covers the condition described above for a period of 10 years or 150,000
miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service,
regardless of ownership.
Dealers are to inspect the transmission oil cooler lines and replace if leaking. The repairs will be
made at no charge to the customer.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after
January 06, 2015 are covered by this special coverage and must be submitted using the labor
operation codes provided with this bulletin. Claims with repair orders prior to January 06, 2015
must be submitted to the Service Contract provider.
VEHICLES INVOLVED
All involved vehicles are identified by Vehicle Identification Number on the Applicable Warranties
section in GM Global Warranty Management system. Dealership service personnel should
always check this site to confirm vehicle involvement prior to beginning any required inspections
and/or repairs. It is important to routinely use this tool to verify eligibility because not all similar
vehicles may be involved regardless of description or option content.
Copyright 2015 General Motors. All Rights Reserved.

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March 2015

Bulletin No.: 14308A

PART INFORMATION
Parts required to complete this special coverage are to be obtained from General Motors Customer
Care and Aftersales (GMCC&A).
Part Number
20835123
20835125

Description
PIPE ASM-TRANS FLUID CLR LWR
PIPE ASM-TRANS FLUID CLR UPR

Quantity/Vehicle
1
1

20835127
88861003 (US)
19264717 (CN)

PIPE ASM-TRANS FLUID AUX CLR INLET

1

DEXRON®-VI Auto Trans Fluid (1 qt bottle)

As Req.

SERVICE PROCEDURE
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Note: If the customer comments about a transmission fluid leak or there is evidence of a fluid leak
between the hose and the crimp joint near the auxiliary cooler, replace the transmission fluid
cooler inlet and outlet hose/pipe.
2. Determine if the transmission fluid cooler hose/pipes are weeping or leaking fluid between the
hose and the crimp joint near the auxiliary cooler.


If the transmission fluid cooler hose/pipes are weeping or leaking fluid between the hose
and the crimp joint near the auxiliary cooler, replace the inlet and outlet transmission fluid
cooler hose/pipes. Proceed to step 3.



If the transmission fluid cooler hose/pipes are NOT weeping or leaking fluid between the
hose and the crimp joint near the auxiliary cooler, no further action is required.

3. Remove and replace the inlet and outlet transmission fluid cooler hose/pipes. If necessary,
remove and replace the transmission fluid auxiliary cooler inlet hose/pipe. Refer to
Transmission Fluid Cooler Hose/Pipe Replacement in SI.
4. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
CUSTOMER REIMBURSEMENT - For US
Customer requests for reimbursement of previously paid repairs to correct the condition described
in this bulletin are to be submitted to the dealer January 31, 2016 unless otherwise specified by
state law. If this is not convenient for the customer, they may mail the completed Customer
Reimbursement Request Form and all required documents to the GM Customer Assistance Center.
Repairs must have occurred within the 10 years of the date the vehicle was originally placed in
service, or 150,000 miles, whichever occurs first.
All reasonable and customary costs to correct the condition described in this bulletin should
be considered for reimbursement. Any questions or concerns should be reviewed with your
GM representative prior to processing the request.
When a customer requests reimbursement, they must provide the following:

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
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March 2015

Bulletin No.: 14308A

A completed Customer Reimbursement Request Form. This form is mailed to the customer
or can be obtained through GM GlobalConnect.
The name and address of the person who paid for the repair.
Paid receipt confirming the amount of the repair expense, a description of the repair, and
the person or entity performing the repair.

IMPORTANT: GM requires dealers to approve or deny a reimbursement request within 30 days of
receipt. If a reimbursement request is approved, the dealer should immediately issue a check to
the customer and submit an appropriate warranty transaction for the incurred expense. If a
reimbursement request is denied, the dealer MUST provide the customer with a clear and concise
explanation, in writing, as to why the request was denied. The bottom portion of the Customer
Reimbursement Request Form may be used for this purpose. If the denial was due to missing
documents, the customer can resubmit the request when the missing documents are obtained, as
long as it is still within the allowed reimbursement period.
Warranty transactions for customer reimbursement of previously paid repairs are to be submitted
as required by GM Global Warranty Management. Additional information can also be found in
Warranty Administration Bulletin 11-00-89-004.
CUSTOMER REIMBURSEMENT - For Canada and Export
Customer requests for reimbursement of previously paid repairs to correct the condition described
in this bulletin are to be submitted to the dealer prior to or by January 31, 2016. Repairs must have
occurred within the 10 years of the date the vehicle was originally placed in service, or 240,000
kilometers, whichever occurs first.
When a customer requests reimbursement, they must provide the following:
-

Proof of ownership at time of repair.
Original paid receipt confirming the amount of unreimbursed repair expense(s) (including
Service Contract deductibles), a description of the repair, and the person or entity performing
the repair.

All reasonable and customary costs to correct the condition described in this bulletin should be
considered for reimbursement. Any questions or concerns should be reviewed with your GM
representative prior to processing the request.

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Bulletin No.: 14308A

WARRANTY TRANSACTION INFORMATION
Submit a transaction using the table below. All transactions should be submitted as a ZREG
transaction type, unless noted otherwise.
Note: To avoid having to "H" route the customer reimbursement transaction for approval, it must
be submitted prior to the repair transaction.
Labor
Code
9900106
9900107

9900108
9900109

Labor
Time
0.3

Net
Item
N/A

2.3

N/A

Add: To Replace Aux Cooler Inlet Hose

0.2

N/A

Customer Reimbursement Approved
Customer Reimbursement Denied - For US dealers only

0.2
0.1

*
N/A

Description
Transmission Cooler Hose/Pipe Inspection Only, No Further
Action Req.
Transmission Cooler Hose/Pipe Replacement (Includes
Inspection)

* The amount identified in “Net Item” should represent the dollar amount reimbursed to the
customer.

CUSTOMER NOTIFICATION
General Motors will notify customers of this special coverage on their vehicles (see copy of typical
customer letter included with this bulletin - actual divisional letter may vary slightly).

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 tools, equipment, 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 dealer/retailer for information on
whether your vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

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March 2015

Bulletin No.: 14308A

March 2015
Dear General Motors Customer:
As the owner of a 2008 model year Chevrolet Silverado HD or GMC Sierra HD diesel powered
vehicle equipped with a 6 speed automatic transmission, your satisfaction with our product is very
important to us.
This letter is intended to make you aware that some 2008 model year Chevrolet Silverado HD or
GMC Sierra HD vehicles equipped with a 6 speed automatic transmission may have a condition in
which increased transmission oil cooling circuit pressure may cause transmission fluid to weep or
leak. This loss of fluid occurs near the transmission cooler at the crimp joints on the metal ends of
the cooler line where it joins the rubber hose. The increased oil cooling circuit pressure is
experienced during vehicle operation at extreme low outdoor temperatures.
Do not take your vehicle to your GM dealer as a result of this letter unless you believe that
your vehicle has the condition as described above.
What We Have Done: General Motors is providing owners with additional protection for the
condition described above. If this condition occurs on your 2008 model year Chevrolet Silverado
HD or GMC Sierra HD within 10 years of the date your vehicle was originally placed in service or
150,000 miles (240,000 km), whichever occurs first, the condition will be repaired for you at no
charge. Diagnosis or repair for conditions other than the condition described above is not
covered under this special coverage program.
What You Should Do: If you believe that your vehicle has the condition described above, repairs
and adjustments qualifying under this special coverage must be performed by a General Motors
dealer. You may want to contact your GM dealer to find out how long they will need to have your
vehicle so that you may schedule the appointment at a time that is convenient for you. This will
also allow your dealer to order parts if they are not already in stock. Keep this letter with your other
important glove box literature for future reference.
Reimbursement: If you have paid for repairs for the condition described in this letter, please
complete the enclosed reimbursement form and present it to your dealer with all required
documents. Working with your dealer will expedite your request, however, if this is not
convenient, you may mail the completed reimbursement form and all required documents to
Reimbursement Department, PO Box 33170, Detroit, MI 48232-5170. The completed form and
required documents must be presented to your dealer or received by the Reimbursement
Department by January 31, 2016, unless state law specifies a longer reimbursement period.
If you have any questions or need any assistance, just contact your dealer or the appropriate
Customer Assistance Center at the number listed below.
Division

Number

Chevrolet
GMC
Guam
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

1-800-222-1020
1-800-462-8782
65-6267-1752
1-800-496-9992
1-800-496-9993
1-800-496-9994

Text Telephones
(TTY)
1-800-833-2438
1-888-889-2438

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Bulletin No.: 14308A

We are sorry for any inconvenience you may experience; however, we have taken this action in the
interest of your continued satisfaction with our products.
Alicia S. Boler-Davis
Sr. Vice President
Global Quality & Customer Experience
Enclosure
14308A