GM Issues 2020 Corvette Stop Delivery Order For Brake Sensor Contamination

Late this afternoon, GM issued a stop delivery order on 2020 Corvettes due to material contamination in the electronic brake boost system sensor.

As per the order:

Effective immediately, stop the delivery of certain 2020-2021 model year Buick Encore GX, 2020 model year Cadillac CT4, CT5, XT4, Chevrolet Corvette, and 2021 model year Chevrolet Trailblazer vehicles in new or used vehicle inventory. General Motors has notified the National Highway Traffic Safety Administration (NHTSA) about an upcoming safety recall that involves these vehicles. The GM recall number is A202307260.

Material used in the manufacturing process of the sensor connection can exist which may cause an communication breakdown between the sensor and the brake boost system.

A list of affected vehicles in dealer inventory has been sent to Chevy dealers and GM is working with the supplier to acquire the necessary parts to conduct repairs.

Along with the notice to dealers, GM sent a list of FAQs to answer any customer concerns:

Frequently Asked Questions (FAQs) for Safety Recall A202307260

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?
A1) 2020-2021 model year Buick Encore GX, 2020 model year Cadillac CT4, CT5, XT4, Chevrolet Corvette, and 2021 model year Chevrolet Trailblazer vehicles.

Q2) What is the issue or condition?
A2) General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2020 model year Cadillac CT4, CT5 and XT4 vehicles, 2020 model year Chevrolet Corvette vehicles, 2020 – 2021 model year Buick Encore GX vehicles, and 2021 model year Chevrolet Trailblazer 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?
A3) 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?
A4) Dealers will replace the electronic brake boost module.

Q5) What is the safety risk? Is the vehicle safe to drive?
A5) 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?
A6) No, this inspection/repair will be done at no cost to the customer.

Q7) Is the remedy/repair available now?
A7) No, when a remedy is available and/or sufficient quantity of parts are available, the recall bulletin will be released, and dealers can begin repairing vehicles.

Q8) What should customers do until recall repairs can be completed? Are there any special instructions?
A8) 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?
A9) 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 or via NHTSA’s website at

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