2006 chrysler 300 3.5

brake light, ABS and traction lights are on, code U1120 & U0121, the lights go off when I hold the brake pedal down


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  1. U1120 Chrysler- Lost Wheel Distance Message

    Possible causes

    – Can ‘C’ Bus Circuit harness is open or shorted
    – Faulty Anti-Lock Brake System (ABS) harness is open or shorted
    – Faulty Powertrain Control Module (PCM)

    U0121 – Lost Communication With Electronic Brake Control Module
    Possible causes

    – Faulty Electronic Brake Control Module (EBCM)
    – EBCM harness is open or shorted
    – EBCM circuit poor electrical connection

    U0121 Description

    Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.

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