AutoCodes – Chevrolet – U1726 Chevrolet

U1726 Chevrolet 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 Chevrolet 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 616
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 04, 2020
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Code U1726 Chevrolet 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 Chevrolet - Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module - AutoCodes.com
U1726 Chevrolet Code - Right Headlamp High Beam Control Module Lost Communication With Right Headlamp Low Beam Control Module

What are the Possible Causes of the DTC U1726 Chevrolet?

  • 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 Chevrolet?

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 Chevrolet 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 U1726 Chevrolet Code

1. What are the common symptoms of OBDII code U1726 in a Chevrolet related to the right headlamp modules communication issue?

The common symptoms include the right headlamp not functioning properly, dimming or flickering of the headlamp, or the high beam and low beam not working as expected.

2. What are the possible causes of OBDII code U1726 in a Chevrolet indicating a loss of communication between the right headlamp modules?

Possible causes may include damaged wiring or connectors, a faulty control module, a software issue, or a communication network problem within the vehicle.

3. How can I diagnose the U1726 code in a Chevrolet when it indicates a communication problem between the right headlamp modules?

Diagnosing the U1726 code may involve checking the wiring and connectors for damage, testing the control modules for functionality, verifying software updates, and using a diagnostic scanner to inspect the communication network.

4. Is it safe to continue driving with the U1726 code related to the right headlamp communication issue in a Chevrolet?

It is not recommended to drive with the U1726 code present, as it can affect the proper functioning of the right headlamp, compromising visibility and potentially leading to safety issues.

5. Can I repair the U1726 code in a Chevrolet related to the right headlamp modules communication problem myself?

Repairing the U1726 code may require advanced knowledge and tools, so it is advisable to consult a professional mechanic or technician with experience in diagnosing and fixing communication issues in vehicle systems.

6. How much does it typically cost to repair the U1726 code in a Chevrolet due to the right headlamp control module communication failure?

The cost of repairing the U1726 code can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor costs, diagnostic fees, and any necessary software updates.

7. Are there any preventive measures to avoid encountering the U1726 OBDII code in a Chevrolet related to the right headlamp control module communication issue?

Regular vehicle maintenance, including checking the electrical connections and keeping the software up to date, can help prevent communication failures leading to the U1726 trouble code.

8. Can extreme weather conditions or environmental factors contribute to triggering the U1726 code in a Chevrolet indicating a loss of communication between the right headlamp modules?

Yes, extreme weather conditions or environmental factors like water exposure, corrosion, or excessive heat can potentially damage the wiring or connectors, leading to communication issues and the U1726 trouble code.

9. Will resetting the trouble codes using an OBDII scanner fix the U1726 code related to the right headlamp module communication problem in a Chevrolet?

Simply resetting the trouble codes may temporarily clear the U1726 code, but it will likely reappear if the underlying communication issue between the right headlamp modules is not addressed and resolved.

10. How urgent is it to address the U1726 code in a Chevrolet associated with the right headlamp control module communication issue?

It is important to address the U1726 code promptly to ensure the proper functioning of the right headlamp and maintain optimal visibility while driving, enhancing overall safety on the road.

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