AutoCodes – GMC – U2118 GMC

U2118 GMC Code - Lost Communication With Head-Up Display

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Head-Up Display (HUD), Head-Up Display harness is open or shorted, Head-Up Display circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U2118 GMC indicates Lost Communication With Head-Up Display.
Common causes: Common causes include Faulty Head-Up Display (HUD), Head-Up Display harness is open or shorted, Head-Up Display circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 704

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2118 GMC 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 U2118 GMC - Lost Communication With Head-Up Display - AutoCodes.com — U2118 GMC Code - Lost Communication With Head-Up Display

What does this mean?

What are the Possible Causes of the DTC U2118 GMC?

Faulty Head-Up Display (HUD)
Head-Up Display harness is open or shorted
Head-Up Display circuit poor electrical connection

How to Fix the DTC U2118 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U2118 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U2118 GMC Code

1. What are the common symptoms of OBDII code U2118 in a GMC related to Lost Communication With Head-Up Display?

- Common symptoms include the head-up display not functioning, blank display screen, or error messages on the display.

2. What are the possible causes of OBDII code U2118 in a GMC indicating Lost Communication With Head-Up Display?

- Potential causes include a faulty head-up display module, damaged wiring or connectors, communication bus issues, or a malfunctioning control module.

3. How can I diagnose the reason behind OBDII code U2118 in my GMC for Lost Communication With Head-Up Display?

- Diagnose by checking the wiring and connectors for any damage, testing the head-up display module, verifying communication on the bus network, and scanning for other related trouble codes.

4. Can a loose connection cause OBDII code U2118 in a GMC for Lost Communication With Head-Up Display?

- Yes, a loose or poor connection between the head-up display module and the vehicle's network can trigger this communication error.

5. Is it possible to reset OBDII code U2118 in a GMC for Lost Communication With Head-Up Display without fixing the issue?

- Resetting the code may temporarily clear the error, but it will likely reappear until the underlying issue with the head-up display communication is resolved.

6. How can I repair OBDII code U2118 in my GMC due to Lost Communication With Head-Up Display?

- Repair options include fixing any damaged wiring, replacing the head-up display module if faulty, ensuring proper connections, and addressing any underlying control module problems.

7. Can extreme temperatures or moisture affect OBDII code U2118 in a GMC related to Lost Communication With Head-Up Display?

- Yes, extreme temperatures or moisture can lead to corrosion, poor connections, or component malfunctions that may trigger communication errors with the head-up display.

8. What role does the control module play in triggering OBDII code U2118 for Lost Communication With Head-Up Display in a GMC?

- The control module oversees communication between various vehicle systems, including the head-up display, so a malfunction in the control module can disrupt this communication and trigger the error code.

9. Are there any specific diagnostic tools recommended for troubleshooting OBDII code U2118 in a GMC for Lost Communication With Head-Up Display?

- Using an OBDII scanner capable of reading manufacturer-specific codes and a multimeter for testing electrical connections are recommended for diagnosing and repairing this issue.

10. Can a software update resolve OBDII code U2118 in a GMC related to Lost Communication With Head-Up Display?

- In some cases, a software update provided by the manufacturer may address communication issues and resolve the error code without requiring physical repairs.