AutoCodes – GMC – U1729 GMC

U1729 GMC 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 GMC 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 573

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 GMC 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 GMC - Right High Beam Control Module Lost Communication With Right Headlamp Horizontal Motor - AutoCodes.com — U1729 GMC 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 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code U1729 in a GMC vehicle?

- Common symptoms include the right high beam not functioning, issues with the right headlamp horizontal motor, and a dashboard warning light indicating a communication problem.

2. What are some possible causes of OBDII code U1729 in a GMC vehicle?

- Possible causes include a faulty right high beam control module, a malfunctioning right headlamp horizontal motor, wiring issues, or a communication breakdown between components.

3. How can I diagnose the OBDII code U1729 in my GMC vehicle?

- Diagnosis typically involves using a diagnostic scanner to read the trouble codes, inspecting the right high beam control module and headlamp horizontal motor, and checking the wiring for any issues.

4. Can I still drive my GMC vehicle with OBDII code U1729 present?

- It is not recommended to drive the vehicle with this code present, as it can affect the functionality of the high beam and headlamp, compromising visibility and safety.

5. How can I repair OBDII code U1729 in my GMC vehicle?

- Repair may involve replacing the right high beam control module, fixing any wiring issues, or replacing the right headlamp horizontal motor. It is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. Is OBDII code U1729 a serious issue in a GMC vehicle?

- While it may not directly impact the drivability of the vehicle, ignoring this code can lead to safety concerns due to impaired lighting functionality. It is recommended to address this issue promptly.

7. Can a DIY enthusiast fix OBDII code U1729 in a GMC vehicle?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this code by following repair guides and procedures. However, professional assistance is recommended for accurate diagnosis and repair.

8. How much does it cost to repair OBDII code U1729 in a GMC vehicle?

- The cost of repair can vary depending on the specific issue causing the code, the labor rates of the repair shop, and the cost of parts. It is advisable to obtain quotes from different mechanics for an accurate estimate.

9. Are there any preventive measures to avoid OBDII code U1729 in a GMC vehicle?

- Regular maintenance, including checking the lighting system and electrical components, can help prevent issues that may trigger this code. Promptly addressing any warning lights or unusual symptoms can also help avoid this problem.

10. Can OBDII code U1729 be intermittent or permanent in a GMC vehicle?

- This code can sometimes be intermittent, appearing and disappearing sporadically. However, it is crucial to address the underlying issue causing the code to prevent potential safety hazards.