AutoCodes - Gmc - U1818 GMC

U1818 GMC Code - Lost Communication With Engine Control Module On Powertrain Expansion Communication Bus

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

|U1818 GMC code possible causes

  • Faulty Engine Control Module (ECM)
  • Engine Control Module harness is open or shorted
  • Engine Control Module circuit poor electrical connection
  • Faulty Hybrid/EV Powertrain Control Module

|How do I fix the U1818 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 U1818 GMC code

Labor: 1.0

The cost of diagnosing the U1818 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 U1818 GMC code possible symptoms?

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

|U1818 GMC code description

Devices connected to the powertrain 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 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 when a supervised periodic message that includes the transmitter device availability has not been received.
OBDII Code U1818 Gmc - Lost Communication With Engine Control Module On Powertrain Expansion Communication Bus - AutoCodes.com

|Need more information with the U1818 GMC code?

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|Need help with a U1818 GMC code?

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|U1818 GMC code comments

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