AutoCodes – Buick – U1729 Buick

U1729 Buick Code - Right High Beam Control Module Lost Communication With Right Headlamp Horizontal Motor

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 Right Headlamp Horizontal Motor, Right Headlamp Horizontal Motor harness is open or shorted, Right Headlamp Horizontal Motor 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: U1729 Buick indicates Right High Beam Control Module Lost Communication With Right Headlamp Horizontal Motor.
Common causes: Common causes include Faulty Right Headlamp Horizontal Motor, Right Headlamp Horizontal Motor harness is open or shorted, Right Headlamp Horizontal Motor 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 444

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1729 Buick 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 Right High Beam Control Module from the Right Headlamp Horizontal Motor has not been received.

OBDII Code U1729 Buick - Right High Beam Control Module Lost Communication With Right Headlamp Horizontal Motor - AutoCodes.com — U1729 Buick Code - Right High Beam Control Module Lost Communication With Right Headlamp Horizontal Motor

What does this mean?

What are the Possible Causes of the DTC U1729 Buick?

Faulty Right Headlamp Horizontal Motor
Right Headlamp Horizontal Motor harness is open or shorted
Right Headlamp Horizontal Motor circuit poor electrical connection
Faulty Right High Beam Control Module

How to Fix the DTC U1729 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 U1729 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 U1729 Buick Code

1. What are common symptoms of OBDII code U1729 in a Buick related to the Right High Beam Control Module?

- Common symptoms include the right high beam not functioning properly, flickering, or remaining stuck in one position.

2. What could cause the Right High Beam Control Module to lose communication with the Right Headlamp Horizontal Motor in a Buick?

- Possible causes include loose or damaged wiring connections, a faulty control module, or a malfunctioning headlamp horizontal motor.

3. Can OBDII code U1729 in a Buick be triggered by a blown fuse?

- Yes, a blown fuse related to the right high beam circuit can also cause the communication loss between the control module and headlamp motor.

4. How can I diagnose the issue causing code U1729 in my Buick?

- Diagnostic steps may include checking the wiring connections, inspecting the control module and motor for faults, and testing the circuit for continuity.

5. Is it safe to continue driving with OBDII code U1729 present in a Buick?

- It is not recommended to drive with this code active, as it can affect the proper functioning of the high beam and compromise visibility while driving at night.

6. Can I reset OBDII code U1729 in my Buick by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it is essential to address the underlying issue causing the communication loss to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code U1729 in a Buick?

- Repair costs can vary depending on the exact cause of the issue, but it may involve replacing the control module, fixing wiring faults, or addressing motor malfunctions.

8. Are there any DIY repair tips for fixing OBDII code U1729 in a Buick?

- DIY enthusiasts can start by checking and securing wiring connections, inspecting for visible damage, and ensuring proper power supply to the control module and motor.

9. Can extreme weather conditions affect the occurrence of code U1729 in a Buick?

- Yes, extreme temperatures or moisture exposure can potentially lead to electrical issues, causing communication problems between the control module and headlamp motor.

10. Should I take my Buick to a professional mechanic for diagnosis and repair of code U1729?

- It is advisable to seek the expertise of a qualified mechanic or technician to accurately diagnose and repair OBDII code U1729 to ensure proper functioning of the high beam system.