AutoCodes – Buick – U135B Buick

U135B Buick Code - Lost Communication With Sunload Sensor

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 Control Module Setting the Diagnostic Trouble Code (DTC), Control Module harness is open or shorted, 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: U135B Buick indicates Lost Communication With Sunload Sensor.
Common causes: Common causes include Faulty Control Module Setting the Diagnostic Trouble Code (DTC), Control Module harness is open or shorted, 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 458

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 May 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U135B 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) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U135B Buick - Lost Communication With Sunload Sensor - AutoCodes.com — U135B Buick Code - Lost Communication With Sunload Sensor

What does this mean?

What are the Possible Causes of the DTC U135B Buick?

Faulty Control Module Setting the Diagnostic Trouble Code (DTC)
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U135B 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 U135B 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 U135B Buick Code

1. What does OBDII code U135B mean on a Buick?

U135B indicates a loss of communication with the sunload sensor, which is responsible for detecting sunlight intensity to adjust climate control settings.

2. What are common symptoms of code U135B on a Buick?

Symptoms may include inconsistent climate control performance, inability to maintain cabin temperature, or no noticeable issues in some cases.

3. What causes the U135B code to trigger?

The code is typically caused by a faulty sunload sensor, wiring issues, a poor connection in the sensor circuit, or a malfunction in the body control module (BCM).

4. How do I diagnose the U135B code on my Buick?

Diagnosis involves inspecting the sunload sensor, checking for damaged or corroded wiring, and using a scan tool to verify communication between the sensor and BCM.

5. Can a faulty sunload sensor damage other systems?

No, a faulty sunload sensor typically wonâ€™t damage other systems, but it can affect climate control functionality and cabin comfort.

6. How do I fix the U135B code?

Repairs may include replacing the sunload sensor, repairing or reconnecting damaged wiring, or reprogramming the BCM if necessary.

7. Is it safe to drive with the U135B code active?

Yes, it is generally safe to drive, but you may experience reduced efficiency or functionality in the climate control system.

8. How much does it cost to repair the U135B code on a Buick?

Repair costs vary, but replacing the sunload sensor typically ranges from $100 to $300, including parts and labor.

9. Can clearing the U135B code solve the issue?

Clearing the code may temporarily reset the system, but the underlying issue must be resolved to prevent the code from returning.

10. Do I need a professional mechanic to fix the U135B code?

While some issues, like checking connections, can be handled by DIY enthusiasts, diagnosing or replacing the sensor may require a professional mechanic with specialized tools.