For Shop Owners

U0121 CHEVROLET - Lost Communication With Electronic Brake Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Faulty Electronic Brake Control Module (EBCM)
  • EBCM harness is open or shorted
  • EBCM circuit poor electrical connection
What does this mean?

Tech notes

There is a factory service bulletin for the following Chevrolet models:

2007-2010 Chevrolet Avalanche
2007-2010 Chevrolet Corvette
2007-2010 Chevrolet Silverado
2007-2010 Chevrolet Suburban
2007-2010 Chevrolet Tahoe
2008-2010 Chevrolet Silverado Hybrid
2008-2010 Chevrolet Tahoe Hybrid

What does this mean?

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U0121 CHEVROLET 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.
OBDII Code U0121 Chevrolet - Lost Communication With Electronic Brake Control Module -

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U0121 CHEVROLET Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the U0121 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 06-14-2015

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