U0146 GMC

Lost Communication With Serial Data Gateway Module

Table of contents

• Possible Causes
• How To Fix
• Cost To Diagnose
• Possible Symptoms
• Description

U0146 GMC Possible Causes

• Faulty Serial Data Gateway Module
• Serial Data Gateway Module harness is open or shorted
• Serial Data Gateway Module circuit poor electrical connection

How do I fix code U0146 GMC?

  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 connector’s pins.

Cost of diagnosing the U0146 GMC code

  The cost of diagnosing the U0146 GMC 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.

Possible Symptoms

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

U0146 GMC 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. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Serial Data Gateway Module has not been received.

Pictures shown may vary from actual