AutoCodes – Generic – U2118

U2118 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 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 4,118

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 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 - Lost Communication With Head-Up Display - AutoCodes.com — U2118 Code - Lost Communication With Head-Up Display

What does this mean?

What are the Possible Causes of the DTC U2118?

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?

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 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.

Need more information about the U2118 code?

Need more information on how to fix the U2118 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2118 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2118 Buick — Lost Communication With Head-Up Display
U2118 Cadillac — Lost Communication With Head-Up Display
U2118 Chevrolet — Lost Communication With Head-Up Display
U2118 GMC — Lost Communication With Head-Up Display

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 Code

1. What are the common symptoms of OBDII code U2118 (Lost Communication With Head-Up Display)?

- Common symptoms include the head-up display not functioning, display flickering on and off, or displaying incorrect information.

2. What are the possible causes of OBDII code U2118?

- Possible causes may include a faulty head-up display unit, damaged wiring or connectors, a communication network issue, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code U2118?

- Diagnose by checking the connections and wiring to the head-up display, testing the control module for communication issues, and scanning for other related trouble codes.

4. What are some general repair tips for addressing OBDII code U2118?

- Repair tips include checking and repairing any damaged wiring or connectors, ensuring proper power and ground connections, and reprogramming or replacing the control module if needed.

5. Can OBDII code U2118 be safely ignored if the head-up display is not a critical component?

- Ignoring the code may not cause immediate issues, but it is recommended to address the underlying problem to prevent potential communication network issues in the future.

6. Is it possible to reset OBDII code U2118 without fixing the root cause?

- While you can clear the code with an OBDII scanner, it is important to address the root cause to prevent the problem from recurring.

7. How do I prevent OBDII code U2118 from happening again after repair?

- To prevent recurrence, ensure all connections are secure, use high-quality replacement parts, and follow proper diagnostic procedures during repair.

8. Can a DIY enthusiast fix OBDII code U2118, or should it be handled by a professional mechanic?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the issue, but complex diagnoses and repairs are best left to professional mechanics.

9. How much does it typically cost to repair OBDII code U2118 at a repair shop?

- Repair costs can vary depending on the underlying cause, but expect to pay for diagnostic time, parts replacement, and labor, which can range from $100 to $500 or more.

10. Is it safe to drive with OBDII code U2118 present in the vehicle's system?

- It is generally safe to drive with this code present, but it is advisable to address the issue promptly to ensure proper functionality of the head-up display and related systems.