U0129 on 2020 Chevrolet Corvette (Stingray 1LT, Stingray 2LT, Stingray 3LT) — Lost Communication With Brake System Control Module A
1 vehicles · 1 makes
Most Reported On
U0129 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2020 Chevrolet Corvette (Stingray 1LT, Stingray 2LT, Stingray 3LT).
Common Causes
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U0129.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does U0129 mean?
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.
What are the most common causes of U0129?
The most common causes of U0129 are: 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. The specific cause varies by vehicle.
How much does it cost to fix U0129?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U0129?
Au7o has documented U0129 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.