AutoCodes – Buick – U1133 Buick

U1133 Buick Code - Lost Communications With DVD Player

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty DVD Player, DVD Player harness is open or shorted, DVD Player 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: U1133 Buick indicates Lost Communications With DVD Player .
Common causes: Common causes include Faulty DVD Player, DVD Player harness is open or shorted, DVD Player 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 486

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1133 Buick Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1133 is set.

OBDII Code U1133 Buick - Lost Communications With DVD Player - AutoCodes.com — U1133 Buick Code - Lost Communications With DVD Player

What does this mean?

What are the Possible Causes of the DTC U1133 Buick?

Faulty DVD Player
DVD Player harness is open or shorted
DVD Player circuit poor electrical connection

How to Fix the DTC U1133 Buick?

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 U1133 Buick 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 U1133 Buick Code

1. What does OBDII code U1133 mean on a Buick?

Code U1133 indicates a loss of communication between the vehicle's control module and the DVD player in the rear entertainment system.

2. What are the symptoms of the U1133 code in a Buick?

Common symptoms include a non-functional or unresponsive rear DVD entertainment system and, in some cases, a warning light on the dashboard.

3. What causes the U1133 code to appear in a Buick?

The code can be caused by faulty wiring, a damaged or failing DVD player, a defective control module, or software communication errors.

4. Can the U1133 code affect the overall performance of my Buick?

No, this code is specific to the rear entertainment system and does not impact the engine or driving performance.

5. How do I diagnose the U1133 code in a Buick?

Diagnose the code by checking the wiring and connectors to the DVD player, scanning for additional trouble codes, and verifying communication signals between the control module and the DVD player.

6. Can I clear the U1133 code without repairing the issue?

Clearing the code without resolving the underlying issue may temporarily remove the warning, but the problem is likely to return.

7. Is the U1133 code a common issue in Buicks?

It is not a widespread issue, but it can occur in models equipped with a rear entertainment system, especially as components age.

8. How can I fix the U1133 code in my Buick?

Repairs may involve replacing damaged wiring, repairing connectors, updating software, or replacing the DVD player if it is faulty.

9. Can I still use my Buick if the U1133 code is active?

Yes, the vehicle can still be driven safely, but the rear entertainment system may not function properly.

10. How much does it cost to repair the U1133 code in a Buick?

Repair costs vary depending on the issue, ranging from $50 for simple wiring fixes to $500 or more for DVD player replacement.

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