Product Safety Recall A202307261 Loss of Brake Assist – 2020 Cadillac CT4, CT5 , & 2021 Chevrolet Trailblazer


General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2020 model year Cadillac CT4, CT5 , 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. 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.


Dealers will replace the electronic brake boost module.

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.


Replace the brake master cylinder. Refer to Brake Master Cylinder Replacement in SI.

CT4 & CT5

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.

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