AutoCodes – Generic – U1518

U1518 Code - Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Head-Up Display Module/Head-Up Display, Head-Up Display Module/Head-Up Display harness is open or shorted, Head-Up Display Module/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: U1518 indicates Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus.
Common causes: Common causes include Faulty Head-Up Display Module/Head-Up Display, Head-Up Display Module/Head-Up Display harness is open or shorted, Head-Up Display Module/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 3,625

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 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1518 Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Instrument Cluster from the Head-Up Display Module/Head-Up Display has not been received.

OBDII Code U1518 - Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus - AutoCodes.com — U1518 Code - Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1518?

Faulty Head-Up Display Module/Head-Up Display
Head-Up Display Module/Head-Up Display harness is open or shorted
Head-Up Display Module/Head-Up Display circuit poor electrical connection
Faulty Instrument Cluster

How to Fix the DTC U1518?

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 U1518 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 U1518 code?

Need more information on how to fix the U1518 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1518 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1518 Buick — Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus
U1518 Cadillac — Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus
U1518 Chevrolet — Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus
U1518 Chrysler — Implausible Ambient Ait Temperature Signal Received
U1518 Dodge — Implausible Ambient Ait Temperature Signal Received
U1518 GMC — Instrument Cluster Lost Communication With Head-Up Display Module/Head-Up Display On LIN Bus
U1518 Jeep — Implausible Ambient Ait Temperature Signal Received
U1518 RAM — Implausible Ambient Ait Temperature Signal Received

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 U1518 Code

1. What does the OBDII code U1518 mean?

U1518 indicates the instrument cluster has lost communication with the Head-Up Display (HUD) module or the HUD module on the Local Interconnect Network (LIN) bus.

2. What are the common symptoms of code U1518?

Symptoms may include the HUD not displaying information, a check engine light or warning light on the dashboard, and possible intermittent or complete loss of HUD functionality.

3. What causes the U1518 code to appear?

Common causes include a faulty HUD module, damaged wiring or connectors in the LIN bus circuit, software issues in the instrument cluster or HUD, or a blown fuse.

4. Can a weak battery cause the U1518 code?

Yes, a weak or failing battery can lead to voltage drops, disrupting communication on the LIN bus and triggering the U1518 code.

5. How can I diagnose the U1518 code?

Start by checking the HUD module connections and inspecting the LIN bus wiring for damage. Use a scan tool to verify communication between the instrument cluster and HUD module.

6. Is U1518 a serious issue?

While it typically doesnâ€™t affect the vehicleâ€™s drivability, it can reduce functionality and driver convenience, especially if the HUD is relied upon for critical information.

7. Can I clear the U1518 code without repairs?

Clearing the code without addressing the root cause may result in it reappearing. Proper diagnosis and repair are necessary to resolve the issue permanently.

8. How much does it cost to fix the U1518 code?

Repair costs vary depending on the cause. Replacing a HUD module may cost several hundred dollars, while fixing wiring or a software update might be less expensive.

9. Can a software update fix the U1518 code?

Yes, in some cases, a software update for the instrument cluster or HUD module may resolve communication issues causing the U1518 code.

10. Should I take my car to a professional for the U1518 code?

If youâ€™re unfamiliar with diagnosing electronic systems or LIN bus circuits, itâ€™s recommended to have a professional technician handle the repair to avoid further damage.