AutoCodes – GMC – U1726 GMC

U1726 GMC Code - Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module

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 Low Beam Control Module, Right Headlamp Low Beam Control Module harness is open or shorted, Right Headlamp Low Beam Control 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: U1726 GMC indicates Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module.
Common causes: Common causes include Faulty Right Headlamp Low Beam Control Module, Right Headlamp Low Beam Control Module harness is open or shorted, Right Headlamp Low Beam Control 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 446

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1726 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 Headlamp High Beam Control Module from the Right Headlamp Low Beam Control Module has not been received.

OBDII Code U1726 GMC - Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module - AutoCodes.com — U1726 GMC Code - Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module

What does this mean?

What are the Possible Causes of the DTC U1726 GMC?

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

How to Fix the DTC U1726 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 U1726 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.

Need more information about the U1726 GMC code?

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Need Help with the Code?

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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 U1726 GMC Code

1. What are the common symptoms of OBDII code U1726 in a GMC vehicle?

- Common symptoms include malfunctioning or inoperative right headlamp high beam, dim or flickering headlight, and possible warning light on the dashboard.

2. What can cause the U1726 code to appear in a GMC vehicle?

- The code U1726 typically appears when there is a communication issue between the right headlamp high beam control module and the right headlamp low beam control module.

3. How can I diagnose the U1726 code in my GMC vehicle?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, checking the wiring and connections between the control modules, and inspecting the headlamp components for any visible damage.

4. Is it safe to drive with the U1726 code illuminated in a GMC vehicle?

- It is recommended to address the issue promptly to ensure proper functioning of the headlamp system, especially during low visibility conditions.

5. Can I repair the U1726 code in my GMC vehicle myself?

- Depending on your automotive repair skills, you may be able to troubleshoot and repair the issue by checking the wiring, connectors, and control modules. However, professional assistance may be required for complex repairs.

6. How much does it cost to fix the U1726 code in a GMC vehicle?

- Repair costs can vary depending on the underlying cause of the communication failure and the labor rates in your area. It's recommended to obtain quotes from reputable mechanics or dealerships.

7. Are there any recalls or technical service bulletins related to the U1726 code in GMC vehicles?

- It is advisable to check with authorized GMC dealerships or visit the National Highway Traffic Safety Administration (NHTSA) website for any relevant recalls or technical service bulletins related to this code.

8. Can extreme weather conditions contribute to the U1726 code in a GMC vehicle?

- Harsh weather conditions, such as extreme cold or moisture, can potentially affect the electrical connections and components associated with the headlamp control modules, leading to communication issues.

9. Will resetting the trouble codes make the U1726 code disappear temporarily?

- Resetting the trouble codes may temporarily clear the U1726 code, but if the underlying issue causing the communication failure persists, the code is likely to reappear.

10. How important is it to address the U1726 code promptly in a GMC vehicle?

- Promptly addressing the U1726 code is essential to ensure proper functioning of the headlamp system, maintain vehicle safety, and prevent potential issues with visibility while driving.