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U0121 CHEVROLET

U0121 CHEVROLET - Lost Communication With Electronic Brake Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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U0121 CHEVROLET Possible Causes

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

First diagnose U0121 CHEVROLET code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

U0121 CHEVROLET 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

Chevrolet Factory Service Bulletin OBDII Code U0121

Cost of diagnosing the U0121 CHEVROLET code

    Labor: 1.0

    The cost of diagnosing the U0121 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

U0121 CHEVROLET 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 - AutoCodes.com

U0121 CHEVROLET More Information

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U0121 CHEVROLET Comments

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