U0129 fault code: what it means

U0129: Lost communication with the brake system control module. ABS and stability warnings come on together.

Network (communication between modules) · Costly if missed

Usual causes, most likely first

ABS module power or fuse fault
CAN wiring fault
failed ABS module
weak 12 V battery

U0129 by make

Lexus

Lost communication with the brake (ABS/VSC) module on a Lexus. Several warning lights come on together.

Usual causes: ABS module power or fuse fault; CAN wiring fault; weak 12 V battery; failed ABS module

Toyota

Lost communication with the brake (ABS/VSC) control module. ABS, VSC and other warnings come on together.

Usual causes: ABS module power or fuse fault; CAN wiring or connector fault; weak 12 V battery; failed ABS module

What the repair usually costs

ABS pump / control module replacement (reman exchange or new)NZ$850–NZ$3,210 · A$780–A$2,880

Not sure what U0129 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.