U0129 on Chevrolet
Lost Communication With Brake System Control Module A
U0129 on Chevrolet vehicles indicates lost communication with brake system control module a. Au7o has documented this code across 1 Chevrolet model — most commonly on Corvette. Sets when a module loses data-bus communication with Brake System Control Module 'A' (integrated brake/booster controller) and no longer receives its expected messages.
Common Causes of U0129
- •Open or shorted bus wiring to the brake system module
- •Corroded or loose connector / poor ground
- •Blown fuse / lost power feed
- •Low battery voltage
- •Failed brake system control module
U0129 on Chevrolet by Model
Chevrolet Corvette(1 issue)
- Electronic Brake Boost Module Sensor Contamination Causing Loss of Brake Assist - Recall 20V5880002020
GM recalled 2020 C8 Corvettes after finding that sensor contamination inside the electronic brake boost (eBoost) module can interrupt communication within the braking system. The C8 uses an electronically boosted brake system rather than a conventional vacuum booster, so when the module drops out the driver loses power assist and must apply substantially higher pedal effort to stop the car. NHTSA identified the consequence as increased crash risk. Owner complaints filed against the 2020 car back this up in blunt terms, with one owner reporting the brakes did fail and that it was difficult to stop the vehicle. Notification and remedy for campaign 20V588000 began December 9, 2020.
Looking for U0129 on a different make?
View U0129 across all makes →Frequently Asked Questions
What does U0129 mean on Chevrolet?▼
U0129 stands for "Lost Communication With Brake System Control Module A." Sets when a module loses data-bus communication with Brake System Control Module 'A' (integrated brake/booster controller) and no longer receives its expected messages. On Chevrolet specifically, this code is documented across 1 model.
What causes U0129 on Chevrolet vehicles?▼
Common causes on Chevrolet: Open or shorted bus wiring to the brake system module, Corroded or loose connector / poor ground, Blown fuse / lost power feed, Low battery voltage, Failed brake system control module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0129 on a Chevrolet?▼
Repair costs vary widely depending on the root cause and specific Chevrolet model.
Which Chevrolet models have U0129 documented?▼
Au7o has documented U0129 on 1 Chevrolet model: Corvette.