AutoCodes - Gmc - U2120 GMC

U2120 GMC Code - Lost Communication With Dynamic Headlamp Leveling Device

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

|U2120 GMC code possible causes

  • Faulty Dynamic Headlamp Leveling (DHL) Device
  • Dynamic Headlamp Leveling Device harness is open or shorted
  • Dynamic Headlamp Leveling Device circuit poor electrical connection

|How do I fix the U2120 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 U2120 GMC code

Labor: 1.0

The cost of diagnosing the U2120 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 U2120 GMC code possible symptoms?

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

|U2120 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. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.
OBDII Code U2120 Gmc - Lost Communication With Dynamic Headlamp Leveling Device - AutoCodes.com

|Need more information with the U2120 GMC code?

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|U2120 GMC code comments

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Repair Importance Level: 3
 
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