GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5616
URGENT - DISTRIBUTE IMMEDIATELY
Date:

December 17, 2020

Subject: N202302720 - Special Coverage
On Track Performance Engine Overheating
Models: 2015-2016 Chevrolet Corvette
Equipped with Manual Transmission (RPO MEK)
2015-2018 Chevrolet Corvette
Equipped with Automatic Transmission (RPO M5U)
To:

All General Motors Dealers

General Motors is releasing Special Coverage N202302720 today. The total
number of U.S. vehicles involved is approximately 22,221. Please see the
attached bulletin for details.
Customer Letter Mailing
The customer letter mailing will begin on December 31, 2021.
Global Warranty Management (GWM)
The Applicable Warranties section on the Investigate Vehicle History (IVH) screen will
be updated December 18, 2020 or sooner. Please hold all warranty transactions until
IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating
Release Date:
Attention:

Make
Chevrolet
Chevrolet

December 2020

Revision:

00

This Special Coverage can be seen in the Applicable Warranties section in Investigate Vehicle History
(IVH).
Model
Corvette Z06
Corvette Z06

Model Year
From
To
2015
2016
2015
2018

RPO
MEK
M5U

Description
Manual Transmission
Automatic Transmission

Involved vehicles are identified on the Applicable Warranties section in GM Global Warranty Management system. This
site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
Condition

Special
Coverage
Adjustment

Certain 2015-2018 model year Chevrolet Corvette Z06 vehicles may have a condition where the vehicle
may overheat and enter a reduced power mode when driven on a track at sustained high speeds in high
ambient temperatures.
This special coverage covers the condition described above for a period of 7 years or 72,000 miles
(116,000 km), whichever occurs first, from the date the vehicle was originally placed in service,
regardless of ownership.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after
December 17, 2020, 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 December 17, 2020, must
be submitted to the Service Contract provider.

Correction

Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are
eligible for reimbursement of their reasonable and customary expenses in accordance with the
procedures specified below. The conditional right to reimbursement is provided by GM solely in the
interest of customer satisfaction and is personal to Customers. Customers may not assign and GM
does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to
receive reimbursement, or any other rights granted by this Special Coverage to any third party,
including but not limited to service contract providers, and this Special Coverage is not intended to
and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights
to reimbursement, against GM, whether in law, equity or otherwise, on any third parties.
Dealers are to install an updated radiator package and, for automatic transmission vehicles, updated
shift-point calibration software. The repairs will be made at no charge to the customer. The customer
must provide evidence of an overheating condition in the form of one of the following: Diagnostic
Trouble Code, photos, or videos. The dealer should make a copy of any customer evidence provided
and file with the warranty claim.

Copyright 2020 General Motors. All Rights Reserved.

Page 1 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating
Parts
Automatic Transmission
Quantity
1
1
As Req.

2

As Req.

1
1
1
10

Part Name
Radiator
Radiator Upper Air Baffle
PAG oil

Coolant

Refrigerant

A/C Seal
A/C Seal
SC Gasket – Intake Manifold
SC Bolt – Intake Manifold

Part No.
84524653
84872137
88901445 US
88900060 CA

Obtain locally in
compliance with
GM material
specification
9986181
12346290 US
10953464 CA
Obtain locally in
compliance with
GM material
specification
9986100
12356150 US
10953485 CA
Obtain locally in
compliance with
GM material
specification
9985751 or
9986319
10313109
13579648
12679527
11546958

Manual Transmission
Quantity
4
4
2
1
1
1
1
1
1
1
4
1
1
1
3
1
2
1
10
As Req.

Part Name
MEK, CLAMP ASM, RAD OTLT HOSE
MEK, CLAMP, RAD OTLT HOSE
Radiator Hose Tee
Hose, Radiator Outlet
Hose, Radiator Outlet
Hose ASM, Aux Rad Inlet
Hose, Radiator Inlet
Hose, Radiator Inlet
Pipe ASM
Aux Cooler ASM
Aux Cooler Mounting Studs
Aux Radiator Air Baffle
Radiator Air Baffle
Radiator Air Seal Lower
Radiator Air Seal Retainer
A/C Seal
A/C Seal
Intake Manifold Gasket Kit
Intake Manifold Bolt
PAG oil

Part No.
11547371
11601882
84254392
84254395
84254396
84169802
84254393
84254394
84180422
84082802
11548498
84023053
23342026
23264636
11589290
10313109
13579648
12679527
11546958
88901445 US
88900060 CA

Obtain locally in
compliance with
Page 2 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating

2

GM material
specification
9986181
12346290 US
10953464 CA
Obtain locally in
compliance with
GM material
specification
9986100
12356150 US
10953485 CA
Obtain locally in
compliance with
GM material
specification
9985751 or
9986319

Coolant

As Req.

Refrigerant

Note: Use the vehicle identification number (VIN) and the GM Electronic Parts Catalog (EPC) to determine which parts to
order.
It is estimated that there are only 5% of involved vehicles that will require parts being replaced. Due to the small number
of vehicles anticipated that will need this repair and the limited initial parts availability, dealers are encouraged
not to order these parts for use as shelf stock.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9900755
9900424*

Description
Radiator Replacement (17-18 MY Automatic Transmission only)
Radiator Replacement (15-16 MY Automatic Transmission only)
Add: TCM Reprogramming
Or
Add: TCM Reprogramming Same Cal Block
Auxiliary Radiator Installation (Manual Transmission only)
Customer Reimbursement Approved
- For USA and Canada dealers only
- For Export dealers only
Customer Reimbursement Denied – For USA dealers only

9900756
9900757

9900758

Labor
Time
2.5
2.5
0.7
0.2
4.5
N/A
0.2
N/A

Trans.
Type
ZREG
ZREG

Net
Item
N/A
N/A

ZREG
ZREG

N/A
**

ZREG

***

Important: The customer must provide evidence of an overheating condition in the form of one of the following:
•

Diagnostic Trouble Code, photos, or videos.

The dealer should make a copy of any customer evidence provided and file with the warranty claim.
Important: * To avoid warranty transaction rejections, carefully read and follow the instructions below:
•

The Warranty Claim Code must be accurately entered in the “Warranty Claim Code” field of the transaction.

•

When more than one Warranty Claim Code is generated for a programming event, it is required to document all
Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the
“Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the
FINAL code provided by SPS/SPS2.

Warranty Claim Code Information Retrieval
If the Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows:
1.
2.
3.

Open TLC/TIS on the computer used to program the vehicle.
Select and start SPS/SPS2.
Select Settings.
Page 3 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating
4.

Select the Warranty Claim Code tab.

The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is
retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code
field.
**

For USA and Canada: Submit the dollar amount reimbursed to the Customer in Net/Reimbursement. Submit $20.00
administrative allowance in Net/Admin Allowance.
For Export: Submit the dollar amount reimbursed to the Customer in Net/Reimbursement.

*** Submit $10.00 administrative allowance in Net/Admin Allowance.
Service Procedure
Automatic Transmission
1.

Replace the radiator. Refer to Radiator Replacement in SI.

Caution: Before downloading the update files, be sure the computer is connected to the internet through a network cable
(hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming,
programming failure or control module damage may occur.
Important: Carefully read and follow the instructions below.

•

Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector.
If there is an interruption during programming, programming failure or control module damage may occur.

•

Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will
interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to
www.gmdesolutions.com for further information. If not available, connect a fully charged 12 V jumper or booster
pack disconnected from the AC voltage supply. DO NOT connect a battery charger.

•

Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights
(including daytime running lights), HVAC, etc.

•

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.

Page 4 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating

5431207
Important: TIS2WEB screen shown. Techline Connect screen is similar and will be included in the near future.
Important: If the same Calibration/Software Warning is noted on the SPS screen, select OK and follow screen
instructions. After a successful programming event, the WCC is located in the Service Programming System dialogue box
of the SPS Summary screen. No further action is required. Refer to the Warranty section of the bulletin.
2.

Reprogram the Transmission Control Module. Refer to K71 Transmission Control Module: Programming and Setup
in SI.
2.1. Select “Refresh Characterization Data” when prompted to select a programming type.

Page 5 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating

5431209

Important: TIS2WEB screen shown. Techline Connect screen is similar and will be included soon.
Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the SPS
Warranty Claim Code (WCC) screen on the job card. Refer to callout 1 above for the location of the WCC on the SPS
screen.
3.

Record SPS Warranty Claim Code on job card for warranty transaction submission.

Manual Transmission
1.

Drain the cooling system. Refer to Cooling System Draining and Filling in SI.

2.

Remove the Front Bumper Fascia Lower Stiffener. Refer to Front Bumper Fascia Lower Stiffener Replacement (LT1
LT4) in SI.

3.

Remove the radiator inlet and outlet hoses. Refer to Radiator Inlet Hose Replacement (LT1 LT4) and Radiator Outlet
Hose Replacement (LT1 LT4) in SI.

4.

Regardless of the model year of your vehicle, refer to 2019 model year Corvette in SI for the remaining instructions.

5.

Install the radiator inlet and outlet hoses. Refer to Radiator Inlet Hose Replacement (LT1, LT4 with V08 Radiator
Outlet Hose Tee to Radiator) and Radiator Outlet Hose Replacement (LT1, LT4 with V08 Radiator Outlet Hose Tee
to Radiator) in SI.

6.

Install the Auxiliary Radiator. Refer to Auxiliary Radiator Replacement (LT1, LT4 with V08) in SI.

7.

Install the Auxiliary Radiator Inlet pipes. Refer to Auxiliary Radiator Inlet Pipe Replacement (LT1, LT4 with V08) in
SI.

8.

Install the Auxiliary Radiator Inlet hoses. Refer to Auxiliary Radiator Inlet Hose Replacement (LT1, LT4 with V08) in
SI.

9.

Install the Front Bumper Fascia Lower Stiffener. Refer to Front Bumper Fascia Lower Stiffener Replacement (LT1
LT4) in SI.

10. Refill the cooling system. Refer to Cooling System Draining and Filling in SI.
Page 6 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating
Courtesy Transportation – For USA & Canada
Courtesy transportation is available for Customers whose vehicles are involved in a product program and still within the
warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy transportation
program details.
Customer Notification
General Motors will notify Customers of this special coverage on their vehicle (see copy of typical Customer letter included
with this bulletin). The customer must provide evidence of an overheating condition in the form of one of the following:
•

Diagnostic Trouble Code, photos, or videos.

The dealer should make a copy of any customer evidence provided and file with the warranty claim.
Customer Reimbursement
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, 2022. See General Motors Service Policies and Procedures Manual,
Product Field Action Customer Reimbursement Procedure (USA & Canada) or local Policies and Procedures, for details.

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 for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

Page 7 of 8

Special Coverage Adjustment
N202302720 On Track Performance Engine Overheating
January 2021
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
As the owner of a 2015-2018 model year Chevrolet Corvette, your satisfaction with our product is very important to us.
This letter is intended to make you aware that some 2015-2018 model year Chevrolet Corvette vehicles may have a
condition where the vehicle may overheat and enter a reduced power mode when driven on a track at sustained high
speeds in high ambient 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 2015-2018 model year Chevrolet Corvette within 7 years of the date your vehicle was
originally placed in service or 72,000 miles (116,000 km), whichever occurs first, the condition will be repaired for you by
installing an updated radiator package and, for automatic transmission vehicles, updated shift-point calibration software
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. In addition, please provide evidence of engine overheating
such as a stored Diagnostic Trouble Code, photos, or videos.
Reimbursement: If you have already paid for repairs for the condition described in this letter before the date of 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 482325170. The completed form and required documents must be presented to your dealer or received by the
Reimbursement Department by January 31, 2022, unless state law specifies a longer reimbursement period. GM will
only reimburse reasonable repairs relating solely to the condition described in this letter.
The right to submit reimbursement claims is provided by GM solely in the interest of customer satisfaction and is
personal to vehicle owners and lessees who previously paid for repairs referenced in this Special Coverage
(“Customers”) before the date of this letter. Customers may not assign and GM does not consent to any
assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any
other rights granted by this Special Coverage to any third party, including but not limited to service contract
providers, and this Special Coverage is not intended to and does not confer any third party beneficiary,
subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or
otherwise, on any third parties.
If you have any questions or need any assistance, please contact your dealer or the appropriate Customer Assistance
Center at the number listed below.
Division
Chevrolet
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-630-2438
1-800-496-9992
1-800-496-9993
1-800-496-9994

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

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.
Neelie O’Connor
Global Executive Director
Customer Experience Operations
Enclosure
N202302720
Page 8 of 8