AutoCodes – Cadillac – U0158 Cadillac

U0158 Cadillac Code - Lost Communication With Head Up Display Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Head-Up Display Module, Head-Up Display Module harness is open or shorted, Head-Up Display Module 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: U0158 Cadillac indicates Lost Communication With Head Up Display Module.
Common causes: Common causes include Faulty Head-Up Display Module, Head-Up Display Module harness is open or shorted, Head-Up Display Module 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 531

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 Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0158 Cadillac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) 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, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Head-Up Display Module has not been received.

OBDII Code U0158 Cadillac - Lost Communication With Head Up Display Module - AutoCodes.com — U0158 Cadillac Code - Lost Communication With Head Up Display Module

What does this mean?

What are the Possible Causes of the DTC U0158 Cadillac?

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

How to Fix the DTC U0158 Cadillac?

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 U0158 Cadillac 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 U0158 Cadillac Code

1. What are common symptoms of the OBDII code U0158 in a Cadillac related to the Head Up Display module?

- Common symptoms include the Head Up Display not functioning, blank display screen, or intermittent display issues.

2. What are the possible causes of the U0158 code indicating a lost communication with the Head Up Display module in a Cadillac?

- Potential causes may include a faulty Head Up Display module, damaged wiring or connectors, software glitches, or a communication network issue.

3. How can I diagnose the U0158 code in my Cadillac related to the Head Up Display module?

- Diagnosis involves inspecting the wiring and connectors for damage, checking for loose connections, and using a diagnostic scan tool to communicate with the Head Up Display module.

4. Can a DIY enthusiast repair the U0158 code indicating a lost communication with the Head Up Display module in a Cadillac?

- DIY repairs may be possible if the issue is related to a loose connection or damaged wiring. However, complex module replacements or software reprogramming may require professional assistance.

5. Are there any specific repair tips for addressing the U0158 code in a Cadillac with regards to the Head Up Display module?

- Ensure all connections are secure, consider resetting the module by disconnecting the battery for a few minutes, and consult the vehicle's service manual for specific troubleshooting steps.

6. Is it safe to drive my Cadillac with the U0158 code related to the Head Up Display module present?

- It is generally safe to drive the vehicle with this code, but the Head Up Display functionality may be compromised. Addressing the issue promptly is recommended.

7. Can a software update fix the U0158 code indicating a lost communication with the Head Up Display module in a Cadillac?

- In some cases, a software update provided by the manufacturer may resolve communication issues with the Head Up Display module and clear the trouble code.

8. How much does it typically cost to repair the U0158 code in a Cadillac due to a lost communication with the Head Up Display module?

- Repair costs can vary depending on the specific issue, but they may range from a simple connector repair costing around $50 to a module replacement costing several hundred dollars.

9. Are there any preventive measures to avoid encountering the U0158 trouble code in a Cadillac related to the Head Up Display module?

- Regularly inspecting the wiring harness and connectors for signs of wear or damage, and avoiding water exposure to the Head Up Display module can help prevent communication issues.

10. Will resetting the U0158 trouble code related to the Head Up Display module in a Cadillac make it go away permanently?

- Resetting the code may clear it temporarily, but if the underlying issue causing the lost communication is not addressed, the code is likely to reappear.