The Lemon IndexThe other computers in the car stopped hearing from the brake system control module.
Stop and fix now. Don't put it off. This can affect safety, stall the car or cause expensive damage.
Wiring or connector fault on the data network. Then: power or ground problem at the brake system control module; failed brake system control module.
Owners named U0129 in 8 complaints to the U.S. government, most often on the Toyota.
The details
What U0129 means
The other computers in the car stopped hearing from the brake system control module. Features that depend on it can stop working, and several warning lights often come on together.
Can I drive with U0129?
Stop and fix now. Don't put it off. This can affect safety, stall the car or cause expensive damage.
75% of the owner complaints that name U0129 also say the car brakes or ABS act up. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of U0129
- Wiring or connector fault on the data network
- Power or ground problem at the brake system control module
- Failed brake system control module
- Weak battery
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Brakes or ABS act up: 75% of complaints
- Warning lights and electrical faults: 38% of complaints
Share of complaints naming the code whose text also mentions each problem.
Related codes
U0126 U0122 U0121 U0131 U0140 U0111 U0141 U0146
Quick answers
What does U0129 mean?
Lost Communication With Brake System Control Module. The other computers in the car stopped hearing from the brake system control module. Features that depend on it can stop working, and several warning lights often come on together.
Can I drive with U0129?
Stop and fix now. Don't put it off. This can affect safety, stall the car or cause expensive damage.
What causes U0129?
Wiring or connector fault on the data network; Power or ground problem at the brake system control module; Failed brake system control module; Weak battery.
Counts: NHTSA owner complaints whose text names U0129. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.