Condition
General Motors
has decided that a defect which relates to motor vehicle safety exists in certain 2020 model year Chevrolet Corvette vehicles. Material used in a sensor connection in the electronic brake boost system in these vehicles may have been contaminated during the material supplier’s production process. Contamination of this material may cause an interruption of communication between the sensor and the brake boost system under certain conditions. If communication with the sensor is interrupted, electronic brake boost assist could be lost. Extra pedal force will be required to slow and stop the vehicle, increasing the risk of a crash.
Correction
Dealers will replace the electronic brake boost module.
Parts
| Quantity | Part Name | Part No. |
| 1 | Valve Kit – Electronic Traction Control Brake Pressure Module | 84858628 |
| 1 | Retainer – Brake Pedal Push Rod | 84364629 |
| 1 | Bracket – Brake Master Cylinder | 84917923 |
| 6 | Fluid – Brake DOT 4 US | 19299570
ACDelco 798696 GM Original Equipment 10-4086 DOT 4 Hydraulic Brake and Clutch Fluid - 16 oz
Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API |
| 6 | Fluid – Brake DOT 4 CA | 19299571 |
Service Procedure
NOTE: A new Brake Pedal Push Rod Retainer is required to complete this service. DO NOT reuse the original retainer.
NOTE: Be sure to Reprogram and Bleed the system per the SI procedure.
Corvette
Replace the brake master cylinder – with power brake booster and electronic brake control module. Refer to Brake Master Cylinder Replacement – With Power Brake Booster and Electronic Brake Control Module in SI.
Frequently Asked Questions (FAQs) for Safety Recall A202307263
Loss of Brake Assist
These questions and answers are being provided to help GM dealers respond to inquiries from involved vehicle owners about the Safety recall identified above.
Q1)Which vehicles are involved?
2020 model year Chevrolet Corvette vehicles.
Q2)What is the issue or condition?
General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2020 model year Chevrolet Corvette vehicles. Material used in a sensor connection in the electronic brake boost system in these vehicles may have been contaminated during the material supplier’s production process. Contamination of this material may cause an interruption of communication between the sensor and the brake boost system under certain conditions.
Q3) What symptoms may be experienced? What warning signs may be associated with the issue or condition described?
If electronic brake boost assist is lost, a warning light and message may appear in the instrument panel and vehicle speed may be limited.
Q4) What is the remedy/repair?
Dealers will replace the electronic brake boost module.
Q5) What is the safety risk? Is the vehicle safe to drive?
If communication with the sensor is interrupted, electronic brake boost assist could be lost. Extra pedal force will be required to slow and stop the vehicle, increasing the risk of a crash.
Q6) Does the customer have to pay for this remedy/repair?
No, this repair will be done at no cost to the customer.
Q7) Is the remedy/repair available now?
Yes, dealers can begin repairing vehicles.
Q8) What should customers do until recall repairs can be completed? Are there any special instructions?
If special instructions are provided, they will be included in the notification letters to customers.
Q9) How can customers check to see if their vehicle is involved in this field action?
Customers who own a vehicle involved in the field action will be notified by mail by General Motors, but they may also check their Vehicle Identification Number (VIN) for field actions in GM Owner Center at https://my.gm.com/recalls or via NHTSA’s website at https://vinrcl.safercar.gov/vin/.
Q10) If customers are concerned, can they get a rental car or courtesy transportation?
Courtesy transportation is available for customers whose vehicles are involved in this recall and are within the warranty coverage period for the warranty which is associated with this recall. Please refer to Warranty Administration Bulletin #17-NA-073: Field Action Courtesy Transportation Policy for further information.
SEOCONTENT-START
Product Safety Recall
A202307263 Loss of Brake Assist
Copyright 2020 General Motors. All Rights Reserved. Page 1 of 5
Release Date:
March 2021
Revision:
01
Revision Description:
This bulletin has been revised to correct a part number. Please discard all previous copies of bulletin A202307263.
Attention:
It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied.
Vehicles involved in this recall were placed on stop delivery September 24, 2020 under field action # A202307260. Once the service procedure contained in this bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer.
This is the final phase of a phased launch.
All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin has been performed on the vehicle.
Make
Model
Model Year
RPO
Description
From
To
Chevrolet
Corvette
2020
2020
Condition
General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2020 model year Chevrolet Corvette vehicles. Material used in a sensor connection in the electronic brake boost system in these vehicles may have been contaminated during the material supplier’s production process. Contamination of this material may cause an interruption of communication between the sensor and the brake boost system under certain conditions. If communication with the sensor is interrupted, electronic brake boost assist could be lost. Extra pedal force will be required to slow and stop the vehicle, increasing the risk of a crash.
Correction
Dealers will replace the electronic brake boost module.
Parts
Quantity
Part Name
Part No.
1
Valve Kit – Electronic Traction Control Brake Pressure Module
84858628
1
Retainer – Brake Pedal Push Rod
84364629
1
Bracket – Brake Master Cylinder
84917923
6
Fluid – Brake DOT 4 US
19299570
6
Fluid – Brake DOT 4 CA
19299571
IMPORTANT: Additional parts such as mounting brackets and brake pedal clips will be required. Refer to the specific SI procedure to determine what additional ancillary parts may be required. Please order parts accordingly.
Parts required to complete this recall are to be obtained from General Motors Customer Care and Aftersales (GMCC&A). Please refer to your “involved vehicles listing” before ordering parts. Order parts on a CSO = Customer Special Order only. DRO’s may be cancelled. All orders will be reviewed prior to being filled.
It is estimated that less than 800 of the involved vehicles will require parts replaced on this vehicle. Due to the small number of vehicles anticipated that will need this fix and the limited initial parts availability, dealers are encouraged not to order these parts for use as shelf stock. Parts may have quantity limiters in effect.
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
Description
Labor Time
Trans. Type
Net Item
9105559
Replace Brake Master Cylinder (With Power Brake Booster and Electronic Brake Control Module)
– Corvette
Add Time:
with RPO J55
3.2
1.0
ZFAT
N/A
9105560
Floor Plan Reimbursement – NEW INVENTORY ONLY
N/A
*
Product Safety Recall
A202307263 Loss of Brake Assist
Page 2 of 5
Note: * To avoid having to “H” route the floor plan transaction for approval, it must be submitted prior to the repair transaction.
Floor Plan Reimbursement – NEW INVENTORY ONLY
* USA & Canada Only – For vehicles eligible for floor plan reimbursement, the amount should be submitted in Net Item/Miscellaneous. This amount should represent the product of the vehicle’s average daily interest rate (see table below) multiplied by the actual number of days the vehicle was in dealer inventory and not available for sale. This reimbursement is limited to the number of days from the date of the stop delivery message September 24, 2020 to the date the repair is completed, and the vehicle is ready for sale (not to exceed 162 days).
Vehicle
Floor Plan Reimbursement Amount
USA
Canada
2020 Chevrolet Corvette
$8.78
$12.91
Service Procedure
NOTE: A new Brake Pedal Push Rod Retainer is required to complete this service. DO NOT reuse the original retainer.
NOTE: Be sure to Reprogram and Bleed the system per the SI procedure.
Corvette
Replace the brake master cylinder – with power brake booster and electronic brake control module. Refer to Brake Master Cylinder Replacement – With Power Brake Booster and Electronic Brake Control Module in SI.
Dealer Responsibility – For USA & Export (USA States, Territories, and Possessions)
It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied.
The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time.
Dealer Responsibility – All
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession and subject to this recall must be held and inspected/repaired per the service procedure of this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within the CPOIS system, or once again be used in the CTP program.
Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.
Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter. In summary, whenever a vehicle subject to this field action enters your vehicle inventory you must take the steps necessary to ensure the program correction has been made before selling the vehicle. In addition, for vehicles entering your facility for service, you are required to ensure the customer is aware of the open field action and make every reasonable effort to implement the program correction as set forth in this bulletin prior to releasing the vehicle.
Product Safety Recall
A202307263 Loss of Brake Assist
Page 3 of 5
Dealer Reports
For dealers with involved vehicles, a listing has been prepared and will be available through GM GlobalConnect Maxis Field Action Reports or sent directly to export dealers. The Inventory tab of the dealer reports will contain VINs that apply to this recall. This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer In-Service tab will contain customer names and addresses from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall may be a violation of law in several states.
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
USA & Canada – General Motors will notify customers of this recall on their vehicle.
Export – Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act.
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
Product Safety Recall
A202307263 Loss of Brake Assist
Page 4 of 5
IMPORTANT SAFETY RECALL
March 2021
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act.
Previously, you were notified that your 2020 model year Chevrolet Corvette was involved in GM recall A202307260. This letter is to inform you that parts are now available to repair your vehicle under GM recall A202307263.
General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2020 model year Chevrolet Corvette vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products.
IMPORTANT
• Your vehicle is involved in GM safety recall A202307263.
• Schedule an appointment with your GM dealer.
• This service will be performed for you at no charge.
Why is your vehicle being recalled?
Material used in a sensor connection in the electronic brake boost system in these vehicles may have been contaminated during the material supplier’s production process. Contamination of this material may cause an interruption of communication between the sensor and the brake boost system under certain conditions. If communication with the sensor is interrupted, electronic brake boost assist could be lost. If electronic brake boost assist is lost, a warning light and message may appear in the instrument panel and vehicle speed may be limited. Extra pedal force would be required to slow and stop the vehicle, increasing the risk of a crash.
What will we do?
Your GM dealer will replace the electronic brake boost module. This service will be performed for you at no charge. Because of service scheduling requirements, it is likely that your dealer will need your vehicle longer than the actual inspection and service correction time of approximately 4 hours.
What should you do?
You should contact your GM dealer to arrange a service appointment as soon as possible.
Do you have questions?
If you have questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer Assistance Center at the number listed below.
Division
Number
Text Telephones (TTY)
Chevrolet
1-800-630-2438
1-800-833-2438
Puerto Rico – English
1-800-496-9992
Puerto Rico – Español
1-800-496-9993
Virgin Islands
1-800-496-9994
If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE, Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to https://www.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 20V588.
Product Safety Recall
A202307263 Loss of Brake Assist
Page 5 of 5
Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days.
Maryann L. Combs
Vice President
Global Vehicle Safety
GM Recall: A202307263
********************************************************************************************************
Representative Letter – Customer letters are brand, model, and model year specific; listing the 17-digit
VIN and are personalized.
IMPORTANT SAFETY RECALL
March 2021
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act.
Previously, you were notified that your 2020 model year Chevrolet Corvette was involved in GM recall A202307260. This letter is to inform you that parts are now available to repair your vehicle under GM recall A202307263.
General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2020 model year Chevrolet Corvette vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products.
IMPORTANT
• Your vehicle is involved in GM safety recall A202307263.
• Schedule an appointment with your GM dealer.
• This service will be performed for you at no charge.
Why is your vehicle being recalled?
Material used in a sensor connection in the electronic brake boost system in these vehicles may have been contaminated during the material supplier’s production process. Contamination of this material may cause an interruption of communication between the sensor and the brake boost system under certain conditions. If communication with the sensor is interrupted, electronic brake boost assist could be lost. If electronic brake boost assist is lost, a warning light and message may appear in the instrument panel and vehicle speed may be limited. Extra pedal force would be required to slow and stop the vehicle, increasing the risk of a crash.
What will we do?
Your GM dealer will replace the electronic brake boost module. This service will be performed for you at no charge. Because of service scheduling requirements, it is likely that your dealer will need your vehicle longer than the actual inspection and service correction time of approximately 4 hours.
What should you do?
You should contact your GM dealer to arrange a service appointment as soon as possible.
Do you have questions?
If you have questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer Assistance Center at the number listed below.
Division
Number
Text Telephones (TTY)
Chevrolet
1-800-630-2438
1-800-833-2438
Puerto Rico – English
1-800-496-9992
Puerto Rico – Español
1-800-496-9993
Virgin Islands
1-800-496-9994
If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE, Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to https://www.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 20V588.
Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days.
Maryann L. Combs
Vice President
Global Vehicle Safety
GM Recall: A202307263
********************************************************************************************************
GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5700
URGENT – DISTRIBUTE IMMEDIATELY
Date: March 4, 2021
Subject: A202307263 – Safety Recall
Loss of Brake Assist
Models: 2020 Chevrolet Corvette
To: All General Motors Dealers
General Motors is releasing Safety Recall A202307263 today. The total number of U.S. vehicles involved is approximately 674. Please see the attached bulletin for details.
Vehicles involved in this recall were placed on stop delivery September 24, 2020 under field action # A202307260. Once the service procedure contained in the bulletin has been performed on the vehicle, the vehicle is released from stop delivery and the vehicle can be delivered to the customer.
Question and Answer Document (Q&A)
Attached to this message you will find a document that addresses the ten most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns.
Customer Letter Mailing
The customer letter mailing will begin March 18, 2021.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated March 5, 2021 or sooner. A list of involved vehicles in dealer new inventory is attached to this message. Please hold all warranty transactions until IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
************************************************************************************************************
GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5714
URGENT – DISTRIBUTE IMMEDIATELY
Date: March 12, 2021
Subject: REVISION – A202307263-01 – Safety Recall
Loss of Brake Assist
Revised Parts Table
Models: 2020 Chevrolet Corvette
To: All General Motors Dealers
This bulletin has been revised to correct a part number. Please discard all previous copies of bulletin A202307263.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
SEOCONTENT-END
Safety Bulletin re Product Safety Recall A202307263 Loss of Brake Assist
RCSB-20V588-3197.pdf 177.952KB
Safety Bulletin – A202307263 Loss of Brake Assist
RCSB-20V588-9306.pdf 177.602KB
Miscellaneous Document – Frequently Asked Questions (FAQs) for Safety Recall A202307263, Loss of Brake Assist
RMISC-20V588-0486.pdf 83.939KB
ISSUED Owner Notification Letter(Part 577)
RCONL-20V588-4057.pdf 125.736KB
Manufacturer Notices(to Dealers,etc) – Dealer Message re A202307263 – Safety Recall, Loss of Brake Assist
Manufacturer Notices(to Dealers,etc) – Dealer Notification re REVISION – A202307263-01 – Safety Recall Loss of Brake Assist Revised Parts Table
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