How to resolve the u012100 fault code?
2 Answers
The meaning of fault code u012100 is: Lost communication with the following system, the ABS control unit is passive and sporadic; the sensor needs to be replaced. Here is a brief introduction to the Anti-lock Braking System (ABS): 1. The Anti-lock Braking System, abbreviated as ABS. 2. Its function is to automatically control the braking force during vehicle braking, preventing the wheels from locking up and maintaining a state of rolling and sliding (with a slip ratio of about 20%), ensuring maximum adhesion between the wheels and the ground.
I've been in the auto repair business for decades and have encountered numerous U0121 fault codes. It's typically caused by module communication interruption, such as wiring issues in the ABS or body control module – could be due to aged wiring, corrosion, or blown fuses. Take last month's case with a regular customer's car for example: it threw a U0121 code upon startup, showing ABS module communication failure. First checked the fuse box – the corresponding module's fuse was blown, replaced it and problem solved. If the fuse is intact, inspect connectors for looseness or water ingress, as these can cause interference. If the module itself fails, replacement or reprogramming is needed. Recommend getting it checked at a professional shop ASAP to avoid developing into brake failure. Safe driving is paramount – when warning lights appear, slow down and pull over immediately.
