| All About OBDII Engine Codes
AutoCodes - GMC - U2109 GMC

U2109 GMC Code - Lost Communications With Powertrain Multiple Control System

- Code Popularity: 382 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
By - Updated Jun 15, 2020
Share on Facebook   Share on Twitter   Share on Linkedin

|Code U2109 GMC Possible Causes

  • Faulty Powertrain Multiple Control System
  • Powertrain Multiple Control System harness is open or shorted
  • Powertrain Multiple Control System circuit poor electrical connection

|How do I Fix the Code U2109 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.

Does your GMC have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code U2109 GMC?

Labor: 1.0

The cost of diagnosing the U2109 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.

|What are Code U2109 GMC Possible Symptoms?

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

|Code U2109 GMC Description

Modules connected to the Controller Area Network (CAN) 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. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module. A module with a CAN serial data circuits malfunction or which loses power during the current ignition cycle will have a Loss of Communication Diagnostic Trouble Code (DTC) set by other modules that depend on information from that failed module. If any of the CAN circuit are shorted to battery voltage, ground, or between them no communication is possible on the CAN serial data bus, a Diagnostic Trouble Code will set.

OBDII Code U2109 GMC - Lost Communications With Powertrain Multiple Control System -
U2109 GMC Code - Lost Communications With Powertrain Multiple Control System

|Need More Information on the U2109 GMC Code?

Need more information on how to fix the U2109 GMC code? Get Access to Factory Service Manuals

|Need Help with the U2109 GMC Code?

Get the U2109 GMC code diagnosed by a professional: Find a repair shop in your area

|Code U2109 GMC comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U2109 GMC code? Have you replaced any parts?
Any information is appreciated. Thanks