AutoCodes - Gmc - U18A3 GMC

U18A3 GMC Code - Lost Communication With Human Machine Interface Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U18A3 GMC code possible causes

  • Faulty Human Machine Interface Control Module
  • Human Machine Interface Control Module harness is open or shorted
  • Human Machine Interface Control Module circuit poor electrical connection

|How do I fix the U18A3 GMC 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 connector's pins.

|Cost of diagnosing the U18A3 GMC code

Labor: 1.0

The cost of diagnosing the U18A3 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are U18A3 GMC code possible symptoms?

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

|U18A3 GMC code description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices 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 device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.
OBDII Code U18a3 Gmc - Lost Communication With Human Machine Interface Control Module -

|Need more information with the U18A3 GMC code?

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|U18A3 GMC code comments

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